If you saw the technique the old timers who made Lee Enfield barrels used, you'd be quite shocked. They had a chunk of tree trunk, and they eyeballed the center of the bend and whapped the outside of the bend right on center on the trunk. Effectively used the spring back against the bend so that after the thwack the tube springiness tended to hold the tube straight rather than springing back off the bend. The shocking thing was the speed at which they worked, less than a minute a barrel most times.
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