Shaving question…no, not that kind….

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How would you horological pundits go about accurately shaving about .5-1mm off each side of these Komfit spring-loaded links? Thanks.

 
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I would use a garnet cut-off wheel in a Dremel tool, or flex-shaft.
 
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I would wrap the whole thing carefully in something protective and then clamp it down somewhere so it couldn't move much. mask everything you don't want damaged thoroughly just in case you lose control of the dremel. I'd remove ever so slightly less than what I actually want gone under the assumption I'd be doing a bit of touch up sanding/polishing of the cut area.

I'd steer towards a smaller tool with a smaller cut-off wheel to have more control---- unless you have some way of rigging a setup where you can precisely make the cut in a single pass with a larger wheel.

You could clamp something down over the link as well to act as a guide for your blade to keep the cut straight and precise.
 
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I can’t say for sure without actually seeing it, but I might come up with a method of carefully but securely holding it to the bed of the surface grinder, taking many precise passes with a very fine wheel. Only taking off less than a bee’s dick at a time, in fact I probably only take of a gnat’s nasty at a time.
Mind you I couldn’t be arsed of going to all that time and trouble, so would be more likely to just go and get another bracelet!
 
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Use a jewelry vice (with padding) and a metal file and do it by hand. Don’t use a Dremel, or you will likely remove too much. Take your time, check often. I’ve done this a few times with 20mm end links to get them to fit a 19mm lug size. Only time I ruined one was using a Dremel. Took off too much too quickly.

better to do it slow than fast, unless you know what you are doing.
Edited:
 
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I have also done this with a hand file, especially if it's only 0.5mm per side.
 
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Use a jewelry vice (with padding) and a metal file and do it by hand. Don’t use a Drexel, or you will likely remove too much. Take your time, check often. I’ve done this a few times with 20mm end links to get them to fit a 19mm lug size. Only time I ruined one was using a Drexel. Took off too much too quickly.

better to do it slow than fast, unless you know what you are doing.

You can tape your cutoff point or clamp something to where you want to stop cutting (kind of like a brake pad alert?) to help not over-cut with rotary tools, but I agree the risk is always present if you don't take the proper precautions. The major advantage of the rotary is that it can save you a lot of time.

Agree though, that the risk may not be worth it, especially if someone isn't used to working with something like a dremel.
 
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Unless you have a very steady hand I wouldn't recommend using a Dremel. If it's your only option, use a paper grit disc (240/220), not a cutting wheel and mount the Dremel so you can use it like a bench grinder. Have a hand support (wood block) so that you have full control of the work.



The safer way would be with a diamond stone and a bench vice.