Watch Repair Tools & Equipment
Discuss watch repair tools and equipment here. Show off your new tools or discuss care and tool maintenance.
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Recent Topics
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Posts
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I have come across left-handed threads on ratchet wheels several times - without it being indicated with 3 stripes. It has been mentioned before - it was suggested that it was done to save one extra tooling operation (changing to a LH thread tap) -
I would say that most of the Swiss movements that I have worked on over the years have had right hand threaded ratchet wheel screws. However maybe 10% have been left handers. As for the 3 slot marking to indicate reverse threads although I have encountered it on Swiss movements I find it's more of a non-Swiss practice, more common on Russian and Japanese movements. The thing with left hand threads is that they are inteded to prevent the screw from being undone in the event that the component that they are screwed into has a normally anti-clockwise direction of rotation, which would loosen a right handed thread unless there was some other means of preventing the component turning independently of the screw. With the ratchet wheel the screw goes into the mainspring arbor which is locked to the ratchet wheel via the square. Because the square locks everything together the screw can be left or right handed without issue. -
Hi Floyd, welcome to WRT! I'm also pretty new so take everything I say with a grain of salt. You ought to be able to measure the case ID to determine the crystal size and then purchase one of either side of the diameter you think ought to work. As to other parts, there are a couple of resources that will help. One is a website in Germany that will help with information on the movement. The other is a book (that I don't yet have) that seems to have a lot of information. Many of the vendors have this database available online and there are pdf versions that you can get on CD. Looking here will give you a list of domestic (USA) resources for parts and tools if you haven't already found some. -
I think relying on the "stripes" on the screw head is the issue. If they're there, great but don't think that a normal screw head can't be left-handed and don't assume that the ratchet wheel can't have a left-handed screw either.
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My apologies for the necropost, but what book is that?
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