I ordered one from J&L, but the Armstrong 89-441
So I made one yesterday with a radius of ~ 2.85" and a height of ~ .75". I hack sawed out a 3" x 1.5" x 1" piece of steel from a length of
1.5x1.5 steel. Then I drilled holes in it, mounted it on a rotary table on the vertical mill and cut the radius. It works, but now I realize, the dish is sits in is spherical. I can't even imagine how I could have done it right.TIA