In the classic game Pin the Tail on the Donkey, players use a push pin to attach the tail to the donkey. On a metal or plastic toy donkey, however, a push pin would be unable to hold the tail in place ...

Spring pins are mechanical fasteners used for a variety of functions including hinging, aligning and joining Figure 1: Left: coiled spring pin. Right: slotted pin. Source: Spirol two or more parts ...