Was looking for a fun little DIY project and decided to make some floats for my new arm set.
Pretty straight forward ... bought polyethylene closed-cell foam cylinders, cut to length, drilled a hole and sliced into them so then can slide sideways onto the arms. I can't take my balls off my arms, so I couldn't slide them on length-wise.
I made 1.5" and 2" diameter floats. The pic is of the 2" floats. I'll try them out next month in Mexico ...
Here's some pics:

