like I say I have never had anything to do with spinning but steel is steel, there will be some sort of spring back in the steel I'm guessing, along with dealing with the centrifugal force, the taper you have in the part of .020 I would try it with that about taken of your mandrels side angle instead of having a 90 degree it would be 85 degree or what ever it is.
Just thinking about It now if your part fitted to the mandrel exact with the 90 degree corner it would be a pain in the proverbial to remove it from the mandrel. having that under cut angle you could wiggle the part free?
but I'm just guessing here
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Neil
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