Hammer for blade repairing

[Ken S]

I used to live near a small company which made drill bits. They had machines for checking the straightness of drill rod. Part of the process was a device with two pins sticking up. These could be perhaps 1/4” (6mm) in diameter and securely mounted. Between these two pins was a cam with a handle long enough to provide good leverage. As the handle was turned, the cam would put pressure on the drill rod (or knife blade) thus gently straightening it. 

A set up like this would allow you to gradually and gently straighten a knife blade. Perhaps something like this may already be in use. Any thoughts, knifemakers?

Ken