GP fuse blew because of over current. Over current is caused by, very likely, one of the 12v feed is touching the chassis. BTDT.
The fuse will work for a long time whether it is screwed on taut, pre-bended, slight dipped or whatever. Use your common sense as there is nothing to it. A fuse is a fuse and how it is screwed on should not make a difference. It is possible for a fuse to develop a hair line fracture, but it is very different from a blown 80A fuse. A blown 80A fuse would have a 'big' crack, you cannot miss it.
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