I generally use hand straightening, but on problem shafts I use a arrow wrench which is a small block of hardwood about 1/2" thick 5-6" long with a couple of holes drilled through, one 11/32, the other 5/16. using this does leave small depressions in the shaft. you can use heat if the shaft has become too dry and is not responding to bending, this works very well and does not take much heat. once you have the shafts straight then you can take a drill, I use a cordless makita because it is not too fast, I wouldnt use a high speed drill, and sandpaper, start with 80g, hold the paper in one hand folded up and chuck the other end in the drill and squeeze the sandpaper while the shaft turns, this also helps to reduce the thickness of the butt end of the shaft, and remove some of the marks from straightening. dont use too much on the center portion of the shaft until you check the spine as this will weaken it. you can next switch to 220g. you will notice a pith in the center of the shaft, although it is not always true center. for my nock inserts I will remove the pith using a small rat tail file. or you can use a small flat screwdriver, the pith is really soft and is removed easily. I usually go down about 3/4".
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