I walked into Prizers and told the guy I needed a quick grind on my 44. He looked at me with puzzlement and said" In 20 years I have never heard of that, we just replace them". I looked at him in puzzlement and said "I'll take that saw over there". I needed a 44 that cut right then and there so I bought a whole new 44 right there and then. I take them both to Penn- Holo to be worked on. 6 bucks to square up a bar and it is so worth it. They think I am nuts because I have the same bar ground every 2 weeks. Actually that is not why they think I am nuts.
I would like to try one of those deburrers that have 3 sides, that should work. You can't get it right with hand files, you have to have a guide.