I picked up a pack of shockwave mechanicals to try for this year. I took the blades of the one to made sure they were flying with my field tips. They were. When i put it back together to put them on my arrows i ran into some troubles. In the package it gives you like 12 rubber bands, one for each and some extra's and put that around the blades. It also has 3 metal rings...which i have no idea where they go? I couldnt understand the directions on the package so does anyone know what these metal rings are for and where they go? thanks