I've once seen it on TV: in industrial wire production they use a set of castors that bends the wire back and forth, up and down – always a bit less, until its straight. Is there something similar for home use?
How to straighten a piece of wire
metalsteel
Related Solutions
Based on the clarifications, I would recommend using a reusable thread-locking liquid.
Here is a link to one I found that may work. I have not used it.
Vibra-Tite VC3 Threadmate http://www.vibra-tite.com
(I am in no way affiliated with the Vibra-Tite Company)
It may be that the frame was originally designed to have slats span the rails, and not have the mattress (box spring) sit directly on the rails. This would have lifted the mattress up a bit, and possibly allowed it to ride over the bits that are giving you trouble.
This was one persons solution:
Best Answer
I don't know about the machine, but depending on the size of the wire and the length, you can straighten it by holding one end in a vise and then holding the other end in a pliers and giving it a quick jerk. It takes a little practice but it works quite well.
However I would hesitate to use this technique on wire you plan to use for household wiring. If the wire gets stretched too much the diameter of the conductor could be reduced, and likewise the ability to carry the rated current.