I have an early Kohler sewing machine (German made). It was originally a treadle. I would like to put it in a base case and put a hand crank on it. I cannot find any information for the machine online. It is a small machine - perhaps 1/2 size - about the size of a Featherweight. I was also wanting to get a hand crank for my Singer VS2 but it is a larger machine so I'm not sure it would fit both of them. Any of you folks with experience with hand cranks know if the size or configuration of them varies?