The wood about the semi-circular top was removed with saw and chisel, the board held for the chiselling flat on the bench hook.
Its use was illustrated in making the bench hook and shooting board.
The bench hook is a very useful article to have about the work bench.
The bench hook is designed to protect the bench from saw marks and the cuts of chisels, gouges, etc.
This seemed easier after the experience of making the bench hook, and Harry knew how to test for squareness with the try square.