How to install the spring in the lid of the magician's thermos cup?

The method of installing the spring in the magician's thermos cup cover: install the spring on the left side of the widget at the water outlet, and hold the spring with one hand.

1. Assemble the red button and press it. Look carefully at the 2 mm connector on the right side of the button, and install the first spring here.

2. Turn the lid over. There are two butt joints. On the right is the mouth corresponding to the second spring. Press the second spring on the connector and press hard to complete the installation.