Another thing that I haven't seen too much, but works really well, is to use bicycle fork pegs as grips. These things are used by kids that to extreme stunts on their bikes, so they can put their feet up front on the fork. They are very strong, shinny and hollow, usually with a machined grip. You can get them at Toys'R Us for $10-15 a pair. This is what I used for the grip on the saber that is second from the top in the image linked in my first post. Have fun.