the main reason for the stripped threads is by fitting too long setscrews, these bottom out and a light nip pulls the threads, many repair with M8 or up to next unf . this applies to the timing cover and the sump screws, If you do take the sump off on car , should you have difficulty getting a sump to clear the suction tube , you can get to the 3 oil pump bolts through the gap and unscrew to let the pump drop into the sump, all depends on pump / tube design and splash gauze aperture . Pete