Below are some pics of a transformer winder that I made. We did everything from scratch. We even made the set collars from a piece of 1/2" cold roll steel. Right now it's set up to accept two different sizes of bobbins, but we threaded the rod so we can make a different sized bobbin holder when we need to. The bushings on the sides are made of UHMW and the main rod is 3/8" cold roll steel so it will fit inside a hand drill and that has come in very handy. The little plastic piece on the right is a trigger for an optical sensor for the counter which isn't shown. I plan to put a motor on the main spindle and also make an auto traverse, but that will be later. It works for now.