square holes suck
make em round
your buddies are spot on
use hex heads bolts with no threaded portion bearing shear load and lightly round the upper corners of the hex head, then fully polish the bolts.
chainplates are seldom installed where lines or humans can contact them, normally ones with carriage bolts are on the outside of the hull, ie Westsail 32
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Brian Duff
BVI Yacht Sales, Tortola
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