Author: kdk ★2017
Date: 2017-10-04 20:59
At least in English it's called "swedging" and done with swedging piers. I think I've seen it spelled "swaging" in some places.
As to why swedging is better than shimming, I don't know the answer, but since repair people use shims for several other things, I imagine there is some reason. It would be critical to find a shim that's exactly the right thickness - neither too thin, which wouldn't solve the problem or might even add a vibration noise, nor too thick, which would bind the key. Swedging correctly provides exactly the lengthening needed to remove the lost motion without binding.
Karl
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