sailorman
Well-Known Member
I would use a grinder and cut the fitting not the GRP. If you can grind the inner nut through it will split easily enough with a large screw driver twisted in the grind slot. You can then knock out the mushroom or lever it out from the outside. If levering use a scraper (or similar) under your lever to protect the hull.
i would cut a cruciform through the skin fitting flange & very carefully prise the flange, removing in sections,from the outside as the sealant might fracture the gelcoat / laminate if its driven from inside