I've seen several of my dirt track racing competitors narrow rear axle tubes and shorten the axles. They usually cut the flange off, bored the center out, and press-fitted the flange onto the shortened axle shaft before MIG welding it on both sides of the flange. Very few of them broke the welds, even under the stress of repeated high RPM full throttle applications and rough track surfaces.
Jerry
After reading that has crossed my mind, the tube i am not worried about, I have a makeshift jig that will keep it true, plus a couple backyard mechanic tricks
