Re: US GE Clock 60Hz
One possibility:
Leave the original GE hands intact, instead of chopping them off at the shaft end. Cut the donor hands down so that they just consist of a plastic "washer" at the shaft end. Glue these plastic "washers" onto the intact original hands, centering them over the original hands' shaft holes.
Then use emery paper to sand the glued-on plastic part down to 0.3mm, for an overall thickness of (0.3mm + 0.4mm) which is exactly the 0.7mm thickness of the original donor hands. Finally, fill the shaft hole with a temporary shaft (a nail would do the trick) and pour some kind of filler into the gap so that you end up with a shaft-hole, of the right diameter, and a full 0.7mm thickness.
I've never done anything like this but I have used filler materials on carpentry projects.
(I bought two donor clocks, in case the first attempt does not work. If it does work I will use the spare as a bedroom alarm, which is much more restful that constantly reaching for one's mobile phone to get the time.)
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Martin
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