How to install Lego's shoulder decoration in Spider-Man

Spider-Man Lego's shoulder decoration method;

1. First, insert a gray gear into the hole in the shoulder.

2. Then insert a blue flat part into the convex part on the gear.

3. Finally, insert another gray gear into the hole in the blue part.

4. Insert another blue flat part into the convex part on the gear, and finish the shoulder decoration.