Doug I replaced the original with a a Raymarine (airmar) about 5 yrs ago. Just centered the holesaw in the tapered hole and let loose, no problem. The hull was NOT cored just forward of the keel on our full keeled 33-2 . About 3/4 inch of solid fibreglass. Installed with a lick of black Lifecaulk, no leaks. _______________________________________________
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