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.
Having lost several tie pins by theft or by their falling out I made a little device to securely hold the pin in the tie. This device makes it almost impossible t o pull the pin out and it cannot be lost accidentally. The device is made of a small safety pin, bent as shown, with one arm, A, longer than the other, B. The arm A is put on the pin first or upward, and attached as shown at C. When pulling on the tie pin the arms of the holder tend to draw together and clamp it on the pin. - Contributed by Robert C. Knox, Colorado Springs, Colo.