... yup, any and all such "tin" covers should always get some lovin' (bolt flange straightening, so that THEY SEAL... lol... gee, what a concept) with a hammer and dolly or piece of wood... NOT a bigger hammer and/or great gobs of sealant and/or over-tightening... for the following reason...

Puttin' real good ham-fisted gorilla torque is unfortunately sometimes too common