Just out of curiosity, has anyone ever tried to put ball bearings back in the castors? Yes I am aware that new castors can be had. I just installed new ones on a cab, but have two old ones that have lost all the ball bearings. I just like to tinker with things. I am assuming there are 2 sets of bearings in each wheel upper and lower. I was thinking of using BB's, and loading them in. Anyone ever try????