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Without doing the measuring again I think 10-20% is common spring back. I had figured this out a long time ago, more or less. But as the radius is also a result of intended rake, more rake likes smaller radius of mandrel, the equation is somewhat shades of grey. In my experience 1 12" radius will limit the amount of ultimate rake more then I like. My three mandrels are 10", 9" and 6" radius. The 10" has a hard time getting to 50mm+ of rake on a 700C blade. Andy
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