We finished this repair today. We left the mast in the boat and did everything in place. I was able to use a 1/4 drive ratchet to loosen the hose clamps and cut the hose off with a utility knife. The old thru hull came out by hand when I loosened the nut. The old sealant had failed and was what was causing our leak We dropped the board and cut an access hole at the top of the trunk. To get access to the inside of the hole.
The stainless pipe had crevice corrosion where the old hose was sitting on it, so I used a die grinder and ground out the bad material (took off about an inch) I decided I didn't like the hose on pipe threads of the old installation. We glassed in a 1 inch OD piece of G10 fiberglass tube and sleeved it with UHMW we had machined to fit. This was all epoxied in place after I pushed the hose up on the stainless pipe far enough to get access. All of this was done with the mast in place which makes for some tight access.
I glued the old piece back in with some thickened epoxy and then covered it with 2 layers of 1708 biaxial and 2 layers of 6 oz cloth plus peel ply.
We should be splashing very soon, but I think this is a definite upgrade to the previous installation.
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