Bluesti, I know this is an old thread, but I'm curious how your floats have worked since, and if you have made any mods like extensions, sleeves, etc. I'm looking at either the EPS foam balls or the large sized "ball pit" balls with super-glued sleeves inserted into them. This will depend on the total weight of each ball compared to the other type. I'm also thinking of some kind of rubber band to keep each ball pulled tight up to the arm.