How do I fit a SAILSetc fin in the fin box?
A Make a cardboard or 3 mm plywood mock-up of the fin that fits the box as you want it and which is the required size and position. Transfer that profile shape to the fin moulding. Cut the fin to shape and fill the cut edges with filled epoxy resin. Adjust it to fit the box and hull as required. Drill a 1.6 mm hole through the fin just below the top. Drill two 1.6 mm holes through the fin, one near the leading edge, one near the trailing edge and both inside the box just above the hull bottom. Tap these three holes M2. Put M2 csk head x 10 mm long screws (or 8 mm for our newer IOM box) in the holes and adjust them so that the fin is in line with the hull in all senses. If you don’t have an M2 tap use a 1.8 mm drill and ‘self tap’ the screws into place. Wax the inside of the fin box and the hull all around the box. Abrade the fin each side for 10 mm above the bottom of the hull. Put the fin in the box and put filler into the gap using only enough to penetrate about 10 mm up the side of
