The sail number could be your boat number or it could be a number given to the boat for racing. I might have had one bigger bonji and a small one. I use a clove hitch for the tiller and one of the bonji just uses the hooks to move it to the other side.. med tubing would work great. Plus the tubing makes great water balloon cannon. But then who would do that???? Just take some bonjis out to the boat, get the boat sailing nicely, put on the bonjis. They have to be long enough to have some extra stretch so they can pull the tiller. And don't forget about facebook https://www.facebook.com/groups/330782353662726/