I'm currently working through a bit of a problem with my c900: the gearbox is making an rpm-dependent whine. It means I may have a bad bearing somewhere, or the new primary gears I've put in are worn.
This being the case, I've been looking into how to spot a worn bearing, and came across this very good guide, which I thought I'd post here:
Be sure to scroll all the way to the bottom and click the links to see some fantastic roller bearing carnage photos and descriptions!
Do I really have nothing better to do than look at pictures of buggered roller-bearings? Does anybody care?