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Favre lueba 251 can’t let power down manually


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I just got this watch and wound it and to put on timegrapher to make sure it doesn’t have any major problems before I took it apart for service but I can’t get it to unwind so I can take it apart. It winds smoothly and runs great for its age I got it for a good price. When I realized I couldn’t take the power off I cleaned and oiled the balance jewels. But it’s weird because I can turn the stem and hold the click back and it unwinds about a half turn of the crown and then the crown just turns freely and the winding gears stop turning. What’s strange tough is it winds up smoothly but something stops it from unwinding with the crown.Here’s a pic of the click circled. Is there something I’m missing? Thanks13A78A85-864E-4A5E-8839-386EA2DE5771.thumb.jpeg.12e99cc9f31a811ff14d04cb6d8ec0ea.jpeg

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The barrels both turn together, but after manually unwinding about half a revolution the winding gears stop and the stem and crown just turn backwards freely. But it winds up fine and runs fine. When I hold the click back the crown turns a few revolutions and when the winding gears stop the crown turns backwards freely. When I turn the crown the other way it winds properly. Something locks it up while letting the watch unwind with click held back.

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    • The problem is that this movements were not produced with the modern level of standartization, there for parts from one didn't fit well to another, even if they may look the same. May be it doesn't concern the winding stems, but yet there are not spare parts for such movements in supply companies, not even clear calibre identification possible. And where calibre identification  is possible, there are no Ronda numbers for the balance staff or the winding stem for this calibers in the data bases.
    • That black stuff - I had similar things happen with evaporust!  In that case I understand the evaporust eats the iron oxide away without hurting the metal but it can leave behind a layer of carbon which was in the steel that got oxidised. I spent ages trying to perfect a cleaning regime with various different stages in jars in an ultrasonic bath. In the end I switched to washing all but the balance and pallet fork in IPA and gently brushing it with a small artists brush.  I would estimate that I have found an extra 20º of amplitude doing this! It also takes me no longer than waiting hanging over a tank to move stuff to the next jar If it is really bad then I have used the IPA as a prewash and go through my old routine
    • I thought is FHF. Sounds good to make winding stem by myself but I am not in watchmaking on this level. 😄
    • At a friend's request, I've obtained a key for her long case clock which has been silent for some years. On winding it, the weight only rises a foot or so from the floor - & is not visible above the lower panelled section - before the key meets significant resistance. However it then runs quite happily for a day or so by which time the weight is again on the floor. I haven't had the chance to examine the movement but would be grateful for suggestions as to what might be happening here.
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