Flat Lap backing

This one meant to be machined or cast in metal. It is designed for the Ulta Tec platten. It is very thin, and I may need to improve the design. First, I thought it would be silly to use as a backing, but I am using them for preforming all the time now. You need a reamer to correct the diameter of the hole and pressure-sensitive adhesive to adhere the topper to the backing.