glassing the bottom is no worse than glassing anything else BUT if you for some reason don't want to then seal it up with a new thruhull and 5200 then plug it with a bronze pipe cap or a bushing and a bull plug.... my montecarlo had 4... 3 'ducers and 1 speed temp when I got it.... I put 1 'ducer in w speed temp built in and plugged all 3 of the others this way.
This also leaves you a place to hook up a raw water washdown in the future.
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