self larnin' goin' on--narrowing rear axle

hey, if you got a lathe....(your drive shaft is tubing, it does not bend unless u abuse it, and it is not thick wall at all) I'd use some thicker wall tubing, largest diam you can get away with and machine the ends for the "pucks". use a line to check for straightness or a laser. (various types nowadays) solid bar is nice but is overkill but if you insist will prolly cost you about $175 US. (plus shipping) for a 5 ft piece. (thats for 2" round 304 stainless).