that last woodcut above reminds me of the jigs used to straighten bamboo mongolian/korean arrows, where a bend would be heated then bent opposite like shown to straighten it as it cooled. i've seen a film clip of the aboriginies in australia similarly heating a spear shaft in a fire, then bending it under foot to straighten it, a little bit at a time and working their way around till it was acceptably straightened,
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