Hello Guys
As I mentioned in "A Handi Weekend" I made up a barrel channel tool, necessity being the mother of invention, I doubt if I could buy a proper tool within a 1000 miles.
Here it is, simply a piece of aluminum (or steel or brass or plastic) attached to the blade from a Stanley surform #21-297.
It worked real good and cost peanuts. Probably not so good for barrels with a sharp change of taper but for anything else . . . the bees knees.
Cheers - Foster