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This is a very sharing, knowledgeable community so I would like to give something back and encourage others to possibly, do likewise. I've recently replaced the original 7S26a movement in my very early Seiko SKX007 diver with a 7S36a. There is nothing likely wrong with the old movement other than needing a thorough cleaning, oiling and regulating. My original diagnosis of a broken mainspring was in error. It is complete with day and date wheels. The original stem and crown are also included. It's absolutely free to anyone who wants it for a movement on which to practice your repair skills. I'll pay for postage anywhere in the world. The catch? You must do something similar with an item that you no longer need. It has to be watch or clock related, shipped at your expense and at no cost to the recipient. The first PM to me will be the new owner. Anyone?

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    • I wish they would have done so in this case. The whole story went like this: I sent my speedmaster to an omega service center about 10 years ago (at that point of time I haven't even started watchmaking). After the watch came back to me it had only about 6 months wristtime until january 2024 (not fair for this nice watch but the other pieces of my collection want wristtime too 🙂). So my conclusion is that the barrel was already faulty when it came back from service, can't imagine that amount of wear in 6 months wristtime. In january 2024 the performance on the wrist was quite bad, so I decided to have a look by myself. I have to admit that I didn't check the barrel close enough as I thought it must be ok, couldn't have issues after official omega service. That was a mistake, I will learn from that. Follow the golden rule: Nothing is certain except death and taxes.
    • I am same as you oldhippy I won’t touch anything with a battery, I keep getting requests to but I just say I only do mechanical clocks, there are quite a few errors & omissions with the repair guide have a look at this. https://mb.nawcc.org/wiki/Encyclopedia-Subjects/Torsion-Clocks/Book:Horolovar-400-Day-Clock-Repair-Guide-10th-Edition-Errors-and-Updates
    • Nice experiment. As it will be no problem, please put a twice less mass (half of the two penies) and read the amplitude, will be interesting. I mean to determine what is the relation torque/amplitude.
    • parts touching that aren't supposed to touch definitely would cause an issue. there not supposed to be touching there supposed to be independent which means that @VWatchie is correct that the ratchet wheel has no effect on performance. so if the ratchet wheel in your particular case is touching that is definitely going to be an issue and needs to be addressed. did you know that the Swatch group service centers do not change mainsprings? Swatch group service centers have an infinite supply of spare parts so they just change the mainspring barrel the whole thing. Plus anything else the watchmaker doesn't like just gets replaced like anything related to the escapement they just replace the components because they can.
    • The pivots look OK. In this position, balance may rub on the pallet bridge, the roller table may rubb on the pallet fork, the bottom of roller table may rubb on the main plate, and on the tip of the screw that fixes the bottom endstone plate, the impulse jewel may rubb on guard pin, the rounded part of the pivot may rubb on the hole jewe too. Thiss all may be due to broken, missing or moved down endstone, or the plate with the stone has some dirt or other obsticle under it. But, sometimes different odd reasons can exist, like for example someone has changed the balance from a donnor movement. All the reasons are visible and must be checked. For beginning, remove the lever and it's bridge and do the free oscillations test.
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