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 the ordinary clock has served its usefulness and is apparently worn out, the jeweler's price to overhaul it frequently amounts to almost as much as the original purchase price. One weak place in the clock is the escapement wheel. The points soon wear down, thereby producing a greater escapement and pendulum movement, resulting in an increased strain and wear of the clock. If the tips of the teeth on the wheel are bent up slightly with a pair of pliers, the swing of the pendulum will be reduced, thereby increasing the life of the clock. Many of the grandfather's clocks can be put in order in this manner so as to serve as a timepiece as well as a cherished ornament. - Contributed by C. F. Spaulding, Chicago, Ill.