Am I losing my mind? Car's about to hit 100k and I'm planning a massive engine compartment refresh. So I'm inspecting the belt area to verify what type of tensioners & pulleys I need to replace, and I saw something that doesn't look like any of the pictures in my research. Not having ever done this job before I wasn't immediately shocked, but after looking into it deeper it appears that I've been driving for about 12k miles with my idler pulley completely gone, except for the bearing!!! Car seems to run perfectly fine--smooth at all rpms, no cooling or electrical troubles, serpentine belt is under tension, no squealing, but wtf??? Am I missing something?