[Vette Enthusiast]

A while back SeikoPsycho2 (Tom) approached me about possibly collaborating on some jewel replacements for the metal bushings that wear out on Seiko 6138/6139 chronograph bridges for the intermediate min recording wheel and the min recording wheel. These wheels are what drive the min sub dial hand via the chronograph wheel finger. These bushing pivot ports oval out over time producing excessive side shake which can lead to chronograph stoppage.

Tom and I carefully measured the bushings and specd new jewel bushings for both wheels from a trusted Swiss jewel supplier here in the US. I have installed these jewels on a couple of parts movements and they work well. I will be offering these as a service upgrade or bushing failure fix as part of my service offerings on vintage Seiko 6 series chronographs going forward.

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[Sir Alan]

Excellent - the wear to the metal minute and intermediate wheel bushes can be enough to stop a movement running.

 

[Vette Enthusiast]

Thanks Simon. Happy to send a few across the Pond to you to try out if that is something you would be interested in.

 

[zeke441]

Good stuff John, thanks for sharing that info. I have a couple of bridges missing one or both of those bushings.

 

[Vette Enthusiast]

Excellent - the wear to the metal minute and intermediate wheel bushes can be enough to stop a movement running.

Good stuff John, thanks for sharing that info. I have a couple of bridges missing one or both of those bushings.

Happy to provide you both with a few to try out. Thanks Simon and Jerry.

 

[SeikoPsycho2]

Looks like time wasn't on my side to meet John's post with one of my own. I do have a movement in the works and hopefully I'll find the time to complete it shortly. This was a great collaboration between John + I which had been in the works for several months. Two heads are always better then one when it comes to projects like this. These custom jewels don't happen over night and quite an investment is needed to bring them on line. With the two of us working together the initial investment was somewhat easier to handle with the emphasis on "somewhat".....lol.

I knew it was a much needed upgrade for quite some time since I was running out of good used chrono bridges due to worn bushings. Now that we have these jewels, worn out min. + int. min. wheel bushings are a thing of the past.