Originally Posted by pauloman
good advise above but use an epoxy that can bond to posible damp surfaces and is reinforced with fiber/kelvar etc. for strength. Google/Bing Wet Dry 700 epoxy
note that you can insert greased screws/bolts into wet epoxy. When the epoxy cures you can un-screw the bolts and have a threaded/tapped hole.
most excellent advice...thats the prefect way to size holes in unknown materials...
for example most of my deckware has crappy and loose fitted holes done by previous owners or even islander...specifically the main sheet track is HIDEOUS there is no hole that is not oval or lobsided and from below it looks like crap
same for my stanchion holes, however those do get bent out of shape from useage so its not all islanders fault, jejeje