The baby push button hand tool works very simply.

A baby push button consists of 4 parts:
2 rings (with the raised teeth)
1 male
1 female

The male and female rings fit into the hand tool. Place the ring, pointed upwards, on a flat surface (e.g., a tapping block or plastic cutting board). Press the material over the teeth and tap the male or female ring into place with a hammer and the hand tool.