I do mine all on graft paper first, then transfer to a much heavier stock, not cardboard, but almost. I cut the heavier stock out and place on plastic. Tracing the outline is easy onto plastic, and then I cut out the plastic outline with a scroll saw. I then place the outline in the dupe and make tha appropriate measurements. I run the cutter slowly, carefull measuring the stock against what I know are the proper diameter. If I get close but not close enough with the cut I sand the plastic. I keep making adjudgements until I hit my mark on the stock in the lathe. From there you can adjust the scoll tip on the dupe to make a fatter or skinnier plug if you wish.
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