Skip the random guy advice, structured courses still work faster.

Wasting four hours tearing down a working camera over a hair is not the flex you think it is. That track was doing its job fine until you opened it up and started poking at springs and screws, and now you have a camera held together by hope and kitchen table luck. Half the "repairs" on these old bodies create more problems than the junk they were chasing, and yours is a textbook case. Next time spend ten seconds with a flashlight and tweezers first and leave the rest of the thing alone. You got lucky, that hair could have been a bent curtain blade you made worse.

more hours just means more noodling" is painfully true, 30 min forces real choices