pilot bushing

["REICHLE, CHRISTOPHER" <CREICHLE@nsc.msmail.miami.edu>]

Normally the pilot bush for the input shaft is a solid brass bush. I saw a 
pin bearing type of replacement for this bush in a seven enterprises catalog 
for ~$40. Is it worth it? Why and does anyone have any experience using it. 
What's the reason for the roller bearing upgrade?

Thanks,
Chris Reichle