Just file end of cut off axle to a even small radius. than carefully thread on an old axle nut. Using a lot of thin oil on threads slowly turn on the nut a bit back of a bit turn on a bit till nut is on a long ways threads are clean. Next time put nut on first. Use outer face to cut axle at point you want to cut than slowly screw off nut backing up a bit now and than using thin oil. die cutting oil the best to use Charles Nighbor Walnut Creek, CA USA