If you have a table saw, a metal cut off wheel does a very good job of truing the bar edges back to square. I don't know if a cut off wheel is prone to breakage when running metal along it's side, but light passes don't seem to be a risk, and if you epoxy a piece of plywood on the other side, it must surely eliminate the risk and also adds stability to the wheel to keep it from deflecting. You can also take off the burr that way with a very light pass with the bar at an angle. I've trued up many bars that way with a wheel taken off a cut off saw that was worn down to a smaller diameter, probably better than a new wheel that might not fit in your saw anyway. I have to remember to clean out the wood dust from the base of the saw before, with sparks from the bar shooting down there. A cheap portable table saw seems like it would work equally as well, as long as the wheel is square to the table. You probably need to make a metal or wood insert for the hole in the cut off wheel, table saw arbor sizes are generally different from a cut off saw's setup. You can reshape a bar profile that way as well, grind out nicks if you have the groove depth. The sprocket teeth on the end don't like hitting the wheel, but you can get close up.
