Got handed a stripped brake mount by a kid in Tucson last week and he didn't even blink
I was helping out at a co-op downtown, kid rolls in with a mountain bike, says the brake keeps wobbling. I take a look and the threads on the rear disc mount are totally gone, like someone used a wrong bolt and just cranked it. He just shrugs and says, 'Yeah I figured, can you just drill it out for a bigger bolt?' I had to explain that's not how it works. Ended up heli-coiling it for him. He watched the whole thing, asked a ton of questions about thread pitch. Has anyone else had to fix a botched job from a new rider who just didn't know any better?