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I didn't use one. I thought I might make one when the time came, but I never got around to it because things went pretty quick once I got going. On the higher courses, I just stook a cinder block on it's side to support a course in prgress. worked pretty well.
Like Paul in Rockwall , I also didn't use one even though I finished Hendo's oven (the member who introduced this tool to the forum) after he died. If you check out my build, I used a quarter section of a 40" plywood disk to shape my dome which all happened in 2 days. I don't feel that the dome needs to be so precise nor perfect semi circular to perform well or best, so long as it is close and structurally sound.
I even stood up on top of my dome as soon as I placed the final keystone into place and it will stand almost forever.
This 'indispensable tool' increases your build time considerably and serves no real useful purpose but do a search to evaluate it for yourself, There are many postings and several threads with them in.
Check out the following for a starter