Francisco Posted January 30, 2010 Report Share Posted January 30, 2010 One common failure of the Asian 7750 is that some tooth of the ratchet wheel are broken. In such a case the watch has very poor power reserve. Unfortunately, the ETA spare is not compatible, because pivot diameter is too large. A picture of a broken ratchet wheels follows, showing the broken teeth: The measures of the pivots for Asian and ETA ratchets follow: Asian 7750: 0.19 mm ETA 7750: 0.27 mm One approach to solve this problem is using a lathe, as shown here: Without a lathe, another approach is assembling the central part of the Asian ratchet in the gear of the ETA part. It is like making a Quote Link to comment Share on other sites More sharing options...
caruwe Posted January 30, 2010 Report Share Posted January 30, 2010 Very big cinema Thanks Quote Link to comment Share on other sites More sharing options...
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