Never had the need for a straightener once I added neck turning to the first time prep of new brass. AND the use of Lee Collet dies for neck sizing.
https://dl.dropboxusercontent.com/u/47141769/Runout.jpg (link shows full size)
the case on the right as you can see isn't neck turned and has a 0.003 thicker neck on one side. BUT using the Lee Collet keeps the neck concentric even though there's uneven neck thickness.
the case on the left has been turned and will result in straight rounds for the rest of their useful life and the reason I include neck turning as one of THE most important steps in first time brass prep! I never turn to a specific size as it's not necessary since no bushings are used (for the collect die).
and to the OP, when my concentricity gauge showed up it was the worst day in my handloading career! lol completely ruined my day once I started checking rounds!
just my $0.02!
