Well, I have always used drain tubing from a good hardware store like ACE Hardware or Lowes/Home Depot, use your pipe wraps, lay out what you want, 4" disc on the ole DeWalt, then TIG the back on them. They do make the plastic ones that look like those.
Or get the longer straight gauge cups, cut them at the angle you want and go to town...
I made a set out of some old copper tubing recently, used some of those 3M surface conditioning pads, polished them up, everyone thought they looked trick and oldschool........
It was leftover stuff and I used it....
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