>>2978241>What are "DO NOT TOUCH EVER" parts on a camera?are you asking in regards to performing repairs yourself? first thing is discharge the flash capacitor unless you wanna know what 300 volts feels like. until you discharge it, try to only touch the camera one handed; that way if you do get zapped it wont travel through your chest. probably wont kill you but just not a pleasant experience.
other than that, if your image sensor flangeback distance is set with springs, if you remove the image sensor, without the right equipment, you most likely will not get it back to the same position, resulting in a focus shift (this affects DSLRs more than ILCs) as well as tilt. you can count screw turns, but this isnt guaranteed to be right every time. or you can just repeatedly adjust, reassemble camera, check front/back focus, dissasemble, repeat. youd also want to check tilt of the corners, not just front/back focus of the center.
basically id say for most people just dont remove the image sensor. unless its held in position with washers like pic related, common on older cameras. just put the washers back where they were originally. note theres a 3rd spot on top not pictured as well
shutters are not fragile. i finger the fuck out of old ones all the time.