It definitely has to come off, with some frequency.
I guess what I meant with the JB weld was, could I smear some on top of the tank-mount fastener, let it get hard than run a tap of the right size through? Or is just putting a helicoil in the tank mount just as easy?
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I wouldn't JB weld it if you plen on taking off at some future point or maybe even more than once. Might get away with it if you never disturb it. Maybe find a slightly larger self tapping stainless screw.