1. Revised Review
I posted the previous review of one star. I now give 3 stars because of the grinding needed on the back. If not for that I would give a four or a five. Used laser on a tripod, hole saw on a drill same size as the metal part, and a dremel to enlarge hole so you can get the plastic on and off. Start with small drill bit and work your way up until the hole saw center bit will not grab too much and the outside teeth will cut. Flip it over to drill red vs black. Grind back of puck. Look nice. Too bad not a machine cut on the back of the puck.