UHMWP Rod, approx. 1.75 diameter, Grey or even Black would work. I need some to get a prototype "sleeve" device made before we file a provisional. There seem to be many brands/types. What would have the lowest friction coefficient? This thing must rotate easily on the aluminum "barrel" it is going over. Anyone have a good source? I've been impressed at what the GT hive mind has available! And..thanks!