I leave the tailwheel assembly on the cub and run a plastic tube (inch)length thru the spring coil. This tube is a very tight fit in the coil and has monfilament line ca'd to it and the line from the tube is clipped onto the 2 lines form the float. The clips are the tiniest snap connectors available for fishing.

If you use a post in the center of the fuse from below with an arm. You leave the arm there for skis and wheels, but when floats are attached you clip the monofilament lines to each side of the arm, each side of the arm of the water rudder and 10minutes later yu are ready to go.