Kudos to you Mr .Mann,it takes alot and says alot about you to comment on this , but while being no expert mind you I really think this can be fixed ,it would take total removal of whats there and perhaps a little filing of the tang ,but not necessarily so ...hard to say without having it in hand .
I don't think all is lost by no means ,it sounds like you both are reasonable people and can come to an agreement...I've done some checkering and it takes total concentration on our part and mistakes can and will happen to the best of us ...and Doug ,I'm still a big fan !