Originally Posted by weasel56

We have two different machines, one in each shop. (across the street from eachother) The older one is the TC3500 and the newer one that I love is the TCX550. The plastic head on the TC3500 does ride on the rim so you have to be careful it doesn't pick up any trash like shards of metal from a curb-rashed wheel that will embed in the head and scratch wheels after that. (see OP pics) The TCX550's head is locked in place stationary a hair away from the rim so it never comes in contact. That is the only one I really use as it is the best machine I have worked with... ever.