Some more arcane info that will be useless for most people. In addition to Schwinn, Columbia and Rollfast made their own bearings and cranks. And while the Rollfast and Columbia cranks are interchangeable with other brands - the cones and lock washers, etc. are not. The main problem is that both of the companies used a dust cover that works specifically with their own bearing assembles, if you try to mix parts with your typical Wald bearing set things won't work quite right. The whole lot has to be swapped together.