August 26, 201015 yr Brian: I slit and drifted a hole in some 3/4" sucker rod. I upset the middle of the drift about a 1/16", just enough to have a little bulge in the middle. This seemed to work well when the hole shrunk when cooling. Of course, the bar had to slip through the hole very straight and there was no room for adjustment. Also, I had only one long bar through 4 pieces, drifted holes, so I didn't have to make any adjustments.
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