I glued a wooden disk in the bottom of the hole so the tubing leg wouldn't touch the float directly. I heated up the block to cure the epoxy quicker. Don't breathe those buttery fumes! When the epoxy was set up I shaved the protruding plugs off with the tablesaw. I drilled some lashing holes in the sides of the blocks and cut the corners off the ends so they would enter the water better.
Jumping ahead, let's go sailing and I'll show you how this stuff turned out.