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In a month I plan to haul the boat and do a lot of maintenance. One item will be to replace the existing thru hulls with new. Install will be done like Maine Sail advises (G10 backing plate method).
Problem is the existing thru hulls are totally glassed into the hull. The thru hull is either a bronze pipe (threaded on inside of hull where a ball valve would screw on) or maybe they are a true thru hull but the water side and bilge side is all glassed so the only thing visible are threads inside and a hole in the boat outside.
My first plan was to just grind the thru hull out with a 1:12 slope and reglass and drill for the new 1-1/2 inch thru hull. But now thinking maybe I should just try ream out (by grinding, or cutting or both) the existing thru hull so I have a hole slightly bigger than 1-1/2 inch. Then I could just install a new thru hull. Maybe if the new hole were buggered some I may need to put some new epoxy to fill and the drill to 1-1/2 inch. But this would be a lot less work than grinding to the 1:12 slope and reglassing the hull.
The hull is solid glass and the hull is thickened at the existing thru hull so guessing total thickness is 3 inches of solid glass.
Will the method of reaming the hole work? What would you use to cut away the existing thru hull? Maybe a cylidrical grinding wheel?
Regards
Problem is the existing thru hulls are totally glassed into the hull. The thru hull is either a bronze pipe (threaded on inside of hull where a ball valve would screw on) or maybe they are a true thru hull but the water side and bilge side is all glassed so the only thing visible are threads inside and a hole in the boat outside.
My first plan was to just grind the thru hull out with a 1:12 slope and reglass and drill for the new 1-1/2 inch thru hull. But now thinking maybe I should just try ream out (by grinding, or cutting or both) the existing thru hull so I have a hole slightly bigger than 1-1/2 inch. Then I could just install a new thru hull. Maybe if the new hole were buggered some I may need to put some new epoxy to fill and the drill to 1-1/2 inch. But this would be a lot less work than grinding to the 1:12 slope and reglassing the hull.
The hull is solid glass and the hull is thickened at the existing thru hull so guessing total thickness is 3 inches of solid glass.
Will the method of reaming the hole work? What would you use to cut away the existing thru hull? Maybe a cylidrical grinding wheel?
Regards