RE: RC Surfer
I do not know what is the best size o'rings when using wing-nuts, However, I do know the 19mm o'rings are a perfect hold for the original foot-pegs when using a Lisa.
I do break an o'ring or two when I'm charging shore-breaks, but if you saw my vid you can see i'm all about big airs and I always land her on or in front of the wave so it always suffers a hammering. 2mm thick o-rings will break before the surfer does which is piece of mind and changing an o'ring takes only 30 seconds anyway. When I surf normal breaks (notshore-breaks) I very rarely break an o'ring.
I do use wing nuts on my larger home made surfers and use and have broken a few 3mm o'rings ( I have broken the figure a few times also) I think the o'ring pulling against the thread of the bolt attaching the wing-nut may make breaking them easier. I put some heat shrink tube around the bolt to cover the thread and haven't broken an o'ring since so thats my reasoning behind the threadbreaking of the o'ring.
Jimi uses wing-nuts and bolts, so maybe best to ask him. I have never had a problem with an original foot-peg un-threading itself, only breaking one of the sides off. In 3 years that's not bad. I use 3mm wood screws to hold the foot-pegs on and maybe because the thread is so wide they do not un-thread the foot-peg.
Anyway, if whatever you are using works, who cares what ever anyone else says, just as long as you are out at the beach having fun withoutregularproblems!
Brett, good to see you are finally on the water. Shame about the surf conditions!