all my husband did was file it slightly so it would fit. My husband measured the part, and the one on my Silver (1932 15-91) was actually just a hair wider than the one from my newer 15-91's (have several of them). And since I was using the Silver to wind bobbins for my Bailey, I needed it to work with newer bobbins. It worked fine with the ones it came with . . .
I've been using it to wind bobbins (and I wind a lot for the quilting machine) with absolutely no problems since.
BTW - this machine came "serviced" and ready to work. My DH did take about the winder and look it over, and measured it compared to our other ones, and decided that was the easiest, quickest way to make it work.