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Resurrecting an old thread (and have posted in FB group on this as well. The main issue is vintage Seiko mainspring height is 1.0mm or below and the depth of the nbr 7 mainspring winder is about 2.0mm So when you wind the spring in the winder, unless you can keep it taught and pressed against the head of the arbor by pressing on the plunger constantly (which is nearly impossible), the spring unravels as you wind /unwind it. I’m wondering if I you shave down the top of the winder to reduce its height and come closer to the 1.0mm height, might make it work better. I have a spare nbr 7 winder and I might just give this a try (I can file and grind as I have a table top disc sander that I converted to a lapping machine). does this make sense? -
If they don't give enough movement individually then just bend a piece of wire or rod so you can depress them together. -
I thought you were just looking for the Part No. https://www.dumonttools.com/en/products
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By HectorLooi · Posted
316 steel is not hardenable. It is a high corrosion resistant steel. Usually used for marine purposes. -
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