If it is like the 23 and I believe it is this is what you got. There is a gap approx 4” from the underside of the deck liner to the top side of the hull. This is the reason why you need a 6” brass through hull tube to replace the old ones. BUT the problem goes deeper that that. In that space they stuck a chunk of wood encapsulated in glass. They drilled the hole through the deck, wood, and hull to insert the brass tube. My guess the wood is totally rotten out and all you got is black mush in there. First thing to do is remove the tube and start scratching around in there if it comes up reel wood great if it comes up mush you will need to replace that mush with wood or filler first. Some guys have drilled out from the top of the deck a larger hole down to the top of the hull removed the old wood cleaned it up then filled it up and then re drilled the proper size hole for the new brass tube. Good luck
FellowShip
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My motto: Just for the Grins
