if it was me, i would take a single piece of stainless bar stock, a bit wider than the intake grate, and drill and tap it so that the intake grate bolts up to just one single piece of metal instead of 2 small inserts. then i would cut the hull so that i could get the piece i just made to sit in the hull a little deeper than flush to leave room for glassing over. then id epoxy that sucker in there good, then glass over it.
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