J:

Sorry this took so long. I'm had trouble figuring out exactly how this forum stuff works.

The pic shows the right side of the plane. I put the water rudder servo into the hole where the throttle servo would have gone, and ran the flexible pushrod out the right side of the fuse. I secured it and sealed the opening with 5 minute Epoxy. The tube (red) is held down to the top of the float with a couple puddles of the same stuff. (I believe in fast, simple, durable approaches to problems. Drilling holes in floats for screws doesn't fall under that description. )

Bob Hunt
Cadillac, Michigan