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.
A spool of thread may be kept from rolling by gluing squares of cardboard to the ends. The squares should be a little larger than the spool. This will save many a step and much bending over to pick up the spool. The spool, when it falls, will stop where it landed. - Contributed by Katharine D. Morse, Syracuse, N. Y.