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Years ago I had some chain boxes with worn shafts. I noticed that the shafts were worn mostly on one side, so I pressed them out, cleaned them up a bit with some crocus cloth, turned them 180 degrees, and pressed them back in. And with changing to the later style idlers, they were sitting on a different spot along the length of the shaft. I decided that was close enough to being a new wear surface on the shafts.
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