If the damaged area is short, probably your bet bet is to take a 32tpi hackaw and simply trim the bar back. then you can dress the end with a medium half mill file. If you're a lousy sawyer, put a hose clamp onto the bar as a guide.
When you're all done, drop a nickel into each grip before installing them. That'll keep the grips from punching through and protect the end of the bar.
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