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 empty basting-thread spool and make a hole in its side, at A, just large enough to receive a 1/4-in. steel ball. A piece of celluloid, B, is wrapped around the flanges, as shown, and fastened with small brads. An old negative film, well cleaned, is suitable for the celluloid. Be sure to put the steel ball in before fastening the celluloid in place.
Ill: The Steel Ball is Not So Easily Run Into the Hole as It Appears
The difficulty of the puzzle is to get the ball into the hole. - Contributed by R. C. Knox, Waycross, Ga.