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.
Procure an ordinary lag screw, as shown in Fig. 1, cut off the pointed end and file the threads into the shape shown in Fig. 2. A hole is drilled through the head and a handle put in, as shown in Fig. 3. This makes a good substitute screw when the original screw for a small vise is broken. - Contributed by James M. Kane, Doyles-town. Pa.
Ill: A Vise Screw Formed of an Ordinary Lag Screw, the Threads being Made Square and a Handle Attached