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By nevenbekriev · Posted
The movement is so called 'Tongji', standard chinese movement. The stem can still be used with the help of extender. -
By RichardHarris123 · Posted
It opened today, excellent as usual. -
By nevenbekriev · Posted
I will advice to share the idea first here before doeing something to the movement -
When you move the index which changes the timing from an extreme fast to an extreme slow, is there a big change in beat error? Obviously there will be a big change in timing. If there is a big difference in BE then this is strongly inferring the the end-curve of the hairspring isn't set correctly or/and the collet is central to the jewel on the balance cock, because the hairspring that is breathing between the curb pin and boot is being pushed and/or pulled when you move the index from left to right. Also not having the hairspring set correctly can dramatically reduce the amplitude. A quick check is to take power off the movement and move the index from extreme fast to slow and with high magnification see if the hairspring sits nicely between the curb pin and boot at all times (give the balance a spin and watch the hairspring - has it got total freedom?) or if it moves by being pushed or pulled by the curb pin or boot. I'm guessing it is the latter. I think that may be a possibility to your problem. -
By RichardHarris123 · Posted
I can't get windingstens.com to open but you need a few measurements.
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