A glass tab is the ultimate way. But tons of work and not absolutely necessary.
But if youre already dong a ton of work including pulling the cap, then its not much to tab it back in in the grand scheme of things...
If youre not getting that deep into it, then a nice bead of whatever sealant u like between the hull and cap, then thrubolts with fender washers will be just fine, and way better than just tapping screws.
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