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Stock TPI tubes are easily damaged, but Jeff Latimer at JGM has come up with a slick way to fix them. He uses a 11⁄2-inch-diameter steel ball like a mandrel. He then uses several, smaller 11⁄4-inch wood balls to drive the steel ball through the tube to restore its appearance. On some tubes he has to do a little grinding to slide the steel ball through the top part of the tube, but this is a cheap way to fix mangled TPI tubes.