7A28-7000 "Aliens" - replacement pushers - Seiko & Citizen Watch Forum – Japanese Watch Reviews, Discussion & Trading
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Old 01-06-2014, 06:34 AM   #1 (permalink)
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Default 7A28-7000 "Aliens" - replacement pushers

Hi all - new to the boards and very quickly getting into the world of collectable watches...

I bought a 7A28-7000 'Black Ripley' as an engagement gift for my (now) fiancee. She's over the moon with it and wears it every day, which I think is cool for something that she'll have forever a really values. However, the inevitable has happened and one of the yellow pushers has come loose due to a hairline crack. I need to source 2 replacements - I know the parts can be found out there but are rare for obvious reasons. There's also a user (Clockworks) who did a project like this a few years ago and fabricated the parts himself, but I can't seem to get in touch with him.

So - can anyone help me to source these replacements? Better yet, to fit them as well? I have the fine dexterity of a fairground grabber, so would rather avoid doing it myself.

Thanks!
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Old 01-06-2014, 02:55 PM   #2 (permalink)
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Old 01-08-2014, 05:09 AM   #3 (permalink)
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Thank you! This website has officially become a major distraction as I work from home and have no-one watching my screen...
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Old 01-08-2014, 09:41 AM   #4 (permalink)
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Welcome to the SCWF and enjoy. All the best with your hunt.

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Old 01-10-2014, 07:47 AM   #5 (permalink)
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Hi there and welcome from another (fairly) newbie. Good luck with your search.
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Old 01-11-2014, 11:14 AM   #6 (permalink)
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Mark --
Check out <cousinsuk.com> for the parts needed.

Check out <The Tiger UK>for suggestions on the work...

Good Luck-
Eli....
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Old 01-14-2014, 11:35 AM   #7 (permalink)
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Thanks for the suggestion Eli - Cousins list the part but simply call it 'Obsolete' so you can't buy it. Darn these vintage Guigaro designs. I'm wondering if it's worth finding someone who can fabricate the parts...
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Old 01-14-2014, 03:14 PM   #8 (permalink)
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I think that making these would be very easy with access to a milling machine and tower drill (and some skill using these tools).

A hard plastic (such as delrin) is the best material to use, but Aluminium would work (and can be anodised).

Its just a matter of getting the dimensions (using an original pusher) and importantly the location, width and depth of the hole for the pusher head.

I did look into this about a year or so ago, buying some delrin rod and dye (to colour it). Luckily shortly after the materials arrived I managed to buy some original pushers, so the need to fabricate some went away.
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Old 01-14-2014, 03:22 PM   #9 (permalink)
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Yes Sir Alan (sorry, couldn't resist saying it) - I think for someone with experience in fabrication it would probably be reasonably straightforward, the main challenge being the fine tolerances. Once new pushers were made it should then be fairly simple to attach them to the metal heads, either by friction or (in my head) glue/heat.

The reason I can't do this myself is that I'm blessed/cursed with the fine dexterity of a blind elephant and would inevitably make a mess of it.

I don't suppose you're still in touch with the contact you got your replacements from? Or do you fancy resurrecting your project? Time and expenses covered, obviously...
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Old 01-14-2014, 03:32 PM   #10 (permalink)
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I recently asked, and unfortunately the answer was "no" - non available.

I know someone who has their own lathe and I suspect milling machine. I might ask him if he would be prepared to work on this.

The problem is not being able to generate accurate "engineering" drawings to work to. I tend to be a bit of a trial and error type person in this area!!
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Old 01-14-2014, 03:35 PM   #11 (permalink)
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Well if someone felt they were up to the job I can always send a broken pusher over for inspection. It's still in one piece, put cracked through so it's lost the friction grip on the metal. It's all I can do to avoid gluing it, but other forum posts suggest this is a VERY bad idea!
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Old 01-14-2014, 03:58 PM   #12 (permalink)
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OK, you've catalysed me into making contact with the person I know.

Once he responds I'll let you know.
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Old 01-14-2014, 04:13 PM   #13 (permalink)
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Awesome. This is the first lead I have so thank you :-)
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Old 01-19-2014, 01:31 PM   #14 (permalink)
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Try contacting eBay seller 49ronnie (candowatches.net). I think he is the same guy (Ray Canda) we use to buy Alien parts years ago.
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Old 01-19-2014, 01:51 PM   #15 (permalink)
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sorry, I bought the last original Alien pushers years ago and they were yellow, no chance to get black ones.

As far as I remember they were from Ray Canda....



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Old 01-19-2014, 02:01 PM   #16 (permalink)
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Out of interest what does a pusher look like ?
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Old 01-19-2014, 02:33 PM   #17 (permalink)
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A pusher looks like the two yellow plastic blocks in the picture above your post.

They are a hard (brittle) plastic, approx. 6mm x4mm x 5mm with a hole on the underside into which is fitted a shaft. This shaft goes into a hole in the pusher block, with a spring and a c-clip to hold it in place.

They are very prone to cracking, I think because they are moulded onto the shaft and the plastic is under tension.

Very easy to make with the right tools and some material (delrin) - ideally they should be yellow or black.
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Old 01-19-2014, 02:45 PM   #18 (permalink)
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Thanks, interesting.
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Old 01-20-2014, 04:06 PM   #19 (permalink)
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It's definitely an interesting conversation - thanks everyone for your inputs. Not sure how you're getting on SirAlan but just wanted to let you know I've been put in touch with a guy who has a CAD system and 3D printer - he's mocked it up and we may be onto something but I'm seeing him on Sunday to try out a prototype. It'll be interesting to see if: a) we can get the printer to produce a fine enough fit to friction grip the metal rods and b) a suitable yellow finish that's durable enough to last.

Watch this space I guess (no pun intended)... if your guy gets back in the meantime and it looks like the part could be made the traditional way, please still let me know :-)
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Old 01-20-2014, 04:52 PM   #20 (permalink)
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Yes - I did think about the 3D printer approach (having recently watched some videos on another forum of a clock being made with one).

My current opinion is that it will be preferable to glue (araldite?) the plastic pusher onto the head of the stem/shaft. I think a push fit will always tend to fall off. If its too tight, there is the risk of splitting / cracking the pusher.

I've made contact with the person I know and he's expressed an interest to "have a go".

I need to take some photos, take some measurements and do a basic drawing and get them and the delrin rod over to him.

Possibly this w/e depending on how this week pans out.

I also need to practice dying the rod with the yellow dye I bought. Apparently it works, but I need to prove it to myself ....
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Old 01-20-2014, 04:58 PM   #21 (permalink)
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Hi Sir Alan - I agree about gluing if a friction fit doesn't work - I think the other info I'd seen was about gluing originals back on which apparently really disagrees with the old brittle plastic.

Before you commit time to this that I can't agree to cover costs for, shall we see how the 3D print version works out? I'm seeing my guy this weekend so can let you know on Sunday night where we stand. Unless of course you fancy having a go anyway? The pieces are basically L 6mm x W 3.5mm x H 3mm, with a 3mm hole drilled into one 6mmx3.5mm face, offset from one side by 2.5mm and 1.5mm from the other side. Obviously it's very fine tolerances with this!
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Old 01-20-2014, 05:00 PM   #22 (permalink)
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Default That silver Aliens...

Ostendorf - aren't the pushers on a silver watch meant to be black? Not that I'm trying to pinch them or anything, obviously


Quote:
Originally Posted by Ostendorf View Post
sorry, I bought the last original Alien pushers years ago and they were yellow, no chance to get black ones.

As far as I remember they were from Ray Canda....



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Old 01-20-2014, 05:19 PM   #23 (permalink)
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Quote:
Originally Posted by MarkDubya83 View Post
Hi Sir Alan - I agree about gluing if a friction fit doesn't work - I think the other info I'd seen was about gluing originals back on which apparently really disagrees with the old brittle plastic.

Before you commit time to this that I can't agree to cover costs for, shall we see how the 3D print version works out? I'm seeing my guy this weekend so can let you know on Sunday night where we stand. Unless of course you fancy having a go anyway? The pieces are basically L 6mm x W 3.5mm x H 3mm, with a 3mm hole drilled into one 6mmx3.5mm face, offset from one side by 2.5mm and 1.5mm from the other side. Obviously it's very fine tolerances with this!

I'm going to investigate this anyway - I have a few of these watches and the pushers are prone to failure even without use.

Thanks for the measurements - I'll use these as a base, and take a set myself and then compare with yours.

If I get anywhere with this little 'project' I'll let you know.
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Old 01-21-2014, 12:25 PM   #24 (permalink)
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Brilliant - best of luck, look forward to hearing how it goes - likewise, I'll update on the 3D printed versions too!
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Old 02-02-2014, 09:30 AM   #25 (permalink)
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Hi all - just for anyone subscribed to this thread, I've produced a writeup of my adventures into 3D printing, along with some initial results... https://www.thewatchsite.com/20-mod-r...tml#post615545
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