I had them for folks to try at the IRC, “Far and Near” stage. I have been using one since them and have not seen any wear, mine is for a 8 shot. My daughter, 12 years old also uses it, and she has no problem. We load up 30+ moons the night before a match, and it only takes a few minutes. Be sure to let them know what make of moons you have so they can cut the delrin for it.
Howard