Straightening thick wire is harder. I am also a lampworker (making
glass beads) so I found I roll the wire in my hand as I’m hammering
with a Delrin mallet. I just keep rotating the wire as I mallet away
and the wire comes out pretty straight. Not perfect but as straight
as I can. If it is really critical that your thick wires have to be
perfectly straight, then order it in 12" straight lengths. I have to
do that once in a blue moon.