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I successfully managed to snap off the pinion on the escape wheel of the Favre Leuba Cal 253 movement I’m working on. I thought the pinion was in the jewel hole on the wheel bridge but it wasn’t and when I screwed down the bridge and bent/snapped the pinion off. Before I tightened the bridge mounting screws I looked to see if the pinions from the 3 wheels were visible in the jewel holes (used a 45x loop). I guess I didn’t see the escape wheel pinion—maybe the light reflected and it looked as if it were in the jewel hole. My questions is in pushing the escape wheel down when I broke the pinion could I have moved the plate jewel lower into the plate? The reason I ask is that when I take the wheel bridge off the lower gear on the escape wheel is too low to engage the center wheel. Without these two gears meshing there is no power transmitted from the main springs to the escape wheel. I made a “not-to-scale” drawing to illustrate the problem. Could the plate jewel be too far into it’s hole thus lowering the height of the escape wheel?

I have cleaned and oiled a Favre Leuba cal 253 movement and it stops and starts at random intervals. It start running if I tap it or shake it. If i leave the watch on my desk and do not touch it, it runs for over 30 hours--and keeps good time. I have worked on several of these movements with no problems. What should I look for when I take it apart that could be the cause of the intermittent start/stopping? I'm assuming that something is amiss with the balance cock assembly?? because when the watch is stationary it doesn't stop until the main spring winds down. Help!, Thanks