The screen is from Grainger, SS 1/4-20 all-thread, nut, and wing nut from hardware store. 2 3/4" diameter 1/2" wide aluminum from local metal supply. Faced each 1/2" thick aluminum on the lathe, then cut a "seat" the same diameter as the screen (1/8" larger), 1/4" deep. I am going to use a small...