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I don't think anyone mentioned this so...
You cannot really stretch wood fibers, you can only compress them. So a good way to bend is to add a thin strip of metal to the outer diameter. That strips stops the bending action from pulling the OD fibers apart, and only allows the inner fibers to compress.
Wet/steam/boil/heat etc, then compress the ID.
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"A machine you build yourself is a vote for a different way of life. There are things you have to earn with your hands."
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