Tue 14 May 2024: Last night I did some side plate vs two stock pilot holes to determine once and for all if the nice cast brass plate would accommodate the machine screw heads while not sloping the preformed plate. So, no go. But the rolled brass plate from Pecatonica has the rear "hump" adequately high to work perfectly. Have not inlet or drilled it...yet. Just have it scotch taped to precisely spot the marks to dimple. All day I have been working to turn down the diameter of a 3 1/2" zinc plated steel screw 8-32" to the diameter for my 5-40" die. I suspect this screw is not zinc coated steel, but stainless steel. I have the only other such screw picking in vinegar. BTW, the milling chips/fuzz particles are being picked up by the now magnetized screw or vise versa. Duuh, static electricity. Geez, I'm getting old. Whew, also, I just located the 3 nuts and the drill, tap, and die.