Filework (Fileworked)Lisa BeaversF·0 Comments· Decorative marks usually cut (usually by hand) into a knife’s backspring and/or the spine of the blade.  See: Milled. Rare five bladed Robeson knife with all three backsprings decorated with filework (same knife as peatured image). Fileworked three blade Sowbelly by Sheffield Little Mester Stan Shaw, made in 1973.