Mainspring Arbor Size - Seiko & Citizen Watch Forum Japanese Watch Reviews, Discussion & Trading
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Old 10-02-2019, 06:18 AM   #1 (permalink)
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Default Mainspring Arbor Size

Can anybody tell me if the lower mainspring arbor and port on a 7S26 is the same size as one used on a 6139B? Attempting to locate a jewel for a lower arbor port repair on a 6139B. Thanks.
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Old 10-02-2019, 07:09 AM   #2 (permalink)
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I just measured a 7s26b barrell, and the arbor pivots measure 0.97mm mainplate side, 1.47mm bridge side. Be aware that 7s26c has a mainplate jewel as standard and the pivot may be a different size.
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Old 10-02-2019, 08:56 PM   #3 (permalink)
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Quote:
Originally Posted by 7s26b View Post
I just measured a 7s26b barrell, and the arbor pivots measure 0.97mm mainplate side, 1.47mm bridge side. Be aware that 7s26c has a mainplate jewel as standard and the pivot may be a different size.
Thanks for taking the time to measure pivots and provide me with this information. I checked the upper and lower arbors on a 6139B mainspring barrel. Pivots measure 0.97mm manipulate side and 1.47mm bridge side. Looks like they are the same. Again, I am looking at these measurements purely for jewel measurement purposes, not to say one barrel is interchangeable with the other.
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Old 10-02-2019, 10:07 PM   #4 (permalink)
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According to the web - 011123 is 2.4 x 1.5
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Old 10-02-2019, 11:03 PM   #5 (permalink)
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According to the web - 011123 is 2.4 x 1.5
Sorry, you lost me. Is this the OD and ID for the Seiko jewel part number used on 7S26? I am looking at a lower arbor jewel only to fit 6139B.
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Old 10-03-2019, 08:53 AM   #6 (permalink)
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From the forum "search" -https://www.thewatchsite.com/21-japanese-watch-discussion-forum/28800-6139-bizarre-jewel-count.html#/topics/28800?page=1
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