I did not have good luck with the sticking wire between 2- 2x4 method as it didn't take cast out of wire. I broke down and bought a wire straightener from a company called TAK 5 years ago (I think they have been sold and are Novo Precision now). Here is a link to the one I got at Novo Precision but I'm pretty sure you can get from other companies and they are the same. I liked this one because they vgroove the bearings so not to damage or scuff the wire.