flat-file

A flat file should be used for the purpose, first a heavy rough one, for the first cutting.

The upper ends of plate lugs may be cleaned with a flat file, knife., or wire brush.

With a rough flat file, file the edges down, working from the centre line both ways.

When hunting, one does well to carry in his pocket a small flat file with which to sharpen his broad-heads before shooting them.

An old flat file can easily be ground into a suitable knife.