This section is from the book "The Boy Mechanic Vol. 2 1000 Things for Boys to Do", by Popular Mechanics Co.. Also available from Amazon: The Boy Mechanic, Vol2: 1000 Things for Boys to Do.
In planing small pieces on a bench, they usually have a tendency to tip up or slide around. This difficulty can be easily overcome by providing the bench with an extra back stop. For this purpose a discarded plane iron will do very well. Its edge should be notched so that it will easily enter the wood. The edges of its central slot should be beveled off, if an ordinary wood screw is used to fasten it to the bench. A series of holes, several inches apart and in line with the regular back stop, should be bored in the bench so the screw and iron can be readily changed, to fit varying lengths. - Contributed by C. S. Rice, Washington, D. C.
Ill: A Plane Bit Fastened to the Top of a Bench to Hold Blocks While Planing Them