I found a set of Sorby mortise chisels at a yardsale. A few narrower ones seem to be slightly bent - perhaps a 5 degree angle between the blade and handle. I assume it was from overenthusiastic levering. The blades seem to register fine along the bottom half. Is it worthwhile straightening these, and how would you go about it? My temptation s to set them in a vise and gently tap the handle in the right direction, but thought I'd ask if anyone has delalt with this before. Thanks in advance.