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.
When putting a lock on a door it is often difficult to press the two knobs together tightly enough to prevent them from rattling and still be able to insert the screw into the shank. By using a piece of board, 1 in. thick, 6 in. wide and 1 ft. or more in length, with a V-shaped piece cut out of one side,
The Sloping Edges in the Notch Forces the Knobs Together and Holds Them While Inserting the Screws
the knobs can be easily forced and held together while the screw is inserted. - Contributed by H. Musgrave, Sidney, British Columbia.