1. While my Switchback XT was in a press I noticed some slop in the idler wheel and was wondering how much (if any) is allowed? The guy doing the work said it was not a problem but I'm not really ok with that answer so here I am asking you guys.

2. I want to learn how to do all this tech. work myself, so is there a web site I can go to or a book I can buy to learn all the things I need to know?