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Those bars can be a bitch to work with, I know the fun I had trying to cut a bit off one, only a angle grinder will do it. When you have got your bit anneal it with a blow torch till red, then leave...

That's great stuff Rambo, just shows you what you can make out of a bit of junk. I've got a buggered chain saw bar , could be good for a large bowie knife, "That's not a knife, this is a knife", will...