Very clean-looking engine!
I had the same question that the other Don had, but I fear that hand skill is the essential element. "I get a solid center from the start." Hmmm. That's the trick. How to get a solid roll from the start.
I am reminded of a statement made once in this Forum by Golden Bear: "At that point the part just came together in my hand."
We will have to keep practicing and in the meantime admire your skill and talent.
Don
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