nice work, RiverRat. Did you soften the file before working it? have any trouble hardening it? Most of the current file steels are too hard to work, and crack during heat treatment. If you find an old file- antique shops, farm auctions, etc. - they can make very good knives. Get a copy of the Razor Edge Book of Knife Sharpening, about $20.00, from the Razor Edge System, Ely, Minn, or at your bookstore. It is the best book on sharpening knives in print. A fine edge on that knife, that is kept keen by stropping it daily after it is used should give you an edge that will cut patches effortlessly.