Looking for suggestions on how to best straighten square wire.
If you don’t mind marring about 1/4 to 1/2 inch on each end, then
Clamp one end in a fixed vise, grab the other end with some sturdy
pliers (drawtongs work great), and pull the wire enough so you feel
it slightly give/stretch. With square wire, you’ll want to make sure
it’s not twisted before you do this. Once it’s stretches like that,
it will be absolutely straight in the parts not held in the vise or
drawtongs. The wire does have to be annealed to do this, but you say
it already is.