Friction Spring Bullet

A toy for children at home, the bullet casings are few and easily lost, so I referred to several designs and made one myself.

This is the original bullet:

Prepare a spring from a water-based pen

1, First install the spring on the central shaft, and clip a circle of spring from the notch in the protrusion.

2, Push the central shaft into the back of the shell, and the spring can be clipped inside