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Showing content with the highest reputation on 11/14/2022 in all areas

  1. Question -- How to affix a wheel to a pinion that is too small for the hole in the wheel? Background -- After being unable to figure out the cause of the locked pusher, I just ended up doing a complete overhaul. During disassembly, I found the pinion of the chrono minute wheel was broken, but I cannot see how that would cause the pusher to get locked? I also found the wheel referenced above that was supposed to be press-fit onto that chrono minute wheel pinion had the broken bit of that pinion stuck in it. Fortunately, I was able to get the broken pinion piece out of the wheel without damaging it. I ordered a new ETA chrono minute wheel. Anyway, it turned out that the clone's chrono minute wheel pinion is about twice the diameter of the pinion of the gen ETA part. This I did not realize when I installed the new ETA minute wheel & reassembled the movement. So, now, the hole in the wheel that is supposed to be press-fit onto that ETA chrono minute wheel pinion is too large, so the (press-fit) wheel is just spinning free & unable to move the chrono minute hand on the dial. I tried staking the hole smaller, but my smallest concave staking bit only partially closed the hole, so it keeps sliding down the pinion & out of position to mesh with the adjacent wheel. The pics below show the wheel that WAS press-fit onto the chrono minute wheel (which is located on the other side of the movement) & a comparison of the diameter of the clone chrono minute wheel's pinion (thicker) to that of the ETA chrono minute wheel (which is installed in the movement). I was thinking of dabbing a bit of epoxy onto the top of the wheel which I think might work, but I am worried it might migrate down below the wheel & cement it in place. Or, worse, it might migrate into the movement & kill the entire thing. Any of you watchmakers know of a safe & effective way to lock that wheel (circled in the 1st pic) onto that pinion (sticking up through the wheel)?
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