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    Recently purchased a ringmaster attachment for my lathe (Rikon midi). Although I loved trig in high school (I'm now 70)…. I saw your ringmaster video and would like a copy of the excel spreadsheet. I have Excel and am familiar with its use. I believe on the video you stated you could send it to me. Thanking you in advance (I subscribed to the Workshop Companion and look forward to learning fro the pros. Bob Barber