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For the amount of drawtube travel and the speed of rotation of the shaft there should not be any wear to speak of as they are moving together, unless there is a great deal of slippage, which there should not be. Should last a lifetime with normal care, maybe replacing the fine sandpaper once or twice.
Like Lewis' method of using heatshrink fitted over the shaft, why didn't I think of that, much better than metal on metal contact.
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