I bought a 5C collet chuck from CDCO a while back. It's not that I haven't been able to make good parts with it, it's the poor fit up of the collets and the cam lock to the spindle.
I bought this 5C collet from Smalltoolsinc.com It's a TMX made in Poland.
I bought the, no machine, D1-6 cam lock as well.
The difference in quality is substantial. It locks up like my Bisons.
Twice the price but much less than the name brand chucks.
I'll try and sell the original I guess. It works fine, I'm just a freak.