Quote Originally Posted by Jonathan View Post
A pair of, or a single double row angular contact bearing, is generally used to resist axial forces and eliminate end float. I think the problem with thrust bearings is they have to be mounted accurately - each side of the block they are mounted on must be parallel otherwise they will periodically bind. Angular contact bearings probably have a lower coefficient of rolling resistance, though I've not checked.
Thats the word.. Axial... i just couldnt think what it was at 4 in the morning lol..

As for type of bearing I think Jonathan has hit the nail on the head. from a self fabrication point of view, I found that angular contact bearings and the housings were easier to use.