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.
Sash cords or round belts are easily spliced with a coil spring, and for belts this joint will run smooth and noiseless. The coil should be a close fit on the belt, and after turning one end halfway into the spring, the belt itself is twisted in the reverse direction as many times as there are coils remain- ing in the spring, before the other end is turned into it to meet the first. - Contributed by F. S. Cummings, Detroit, Michigan. When painting wireless instruments use black asphaltum, as it has high insulating qualities.
Ill: A Coil Spring User for Splicing Sash Cords or Small Round Belts