Thanks, Matt! Great advice on riveting. I was actually thinking of placing the strap on top of the track, just over the black insert. It would have to be an inverted U type shape. That way the upward force with the car inboard would be spread along three points. It may be hard to fashion a piece of metal that would fit that shape though. It was just one of the first ideas I had. I will try replacing the screw with a large rivet first. If that fails, I may move the track. If you don't think the strap idea is bad I may try that first just because it would be less drilling/riveting. I figure the fewer holes in the aluminum the better.
One day I hope to just buy a brand, spankin new hobie all together and take care of it all at once
. Until then I'll just have to make it work. I love my little junk yard boat though.