Thought I would show you guys some pics of my arrow spinner I built. The arrow spins on 1/2" router ball bearings, the base iswelded outof 3/4" thick matte finish polypropylene (to give it some weight). Not only does it look good, it should last forever. Lay your arrow on top to spin test your broadheads, then lay it on it's side to adjust the rotation of your nocks. There is a hole in the left side that has a steel pin throught the hole, you snap your nock in there. Lay the arrow in the groove on the right side and twist the arrow on the nock. Gives a very consistent way to align nocks. It cost me nothing and works real well.