Lovely work, Runar!
I made my cutter from an old file, and for some reason rounded the tooth a little on the non-cutting side.
Also rounded the actual cutting section, but that is just another style.
Runar,
I have seen guides made of steel ribbon in Scandinavia. Have you seen these or used this type? The steel bar is twisted to for the rifling pitch, and must be re-indexed for each cut.
Best wishes
Richard.