The base of my lathe is two parallel tubes. I laid a spun blank on in and it rolled, stopped rolled back a little and stopped.
I had to have done that a thousand times in the past but never took notice. The wood and the tubes only touch at a point, barely at all, and the wood rolls very easily. When it stops mark the top.
If the lathe base isn't built like that I'm sure that mocking one up and leveling it would be a snap.
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