Assemble back a momentary switch
The clips slide on the metal part in the base to control the flow of electricity, they somehow fit into the moving part of the button,

the spring goes inside the bottom of the moving part.

the J shape goes under the moving part and the spring and hooks back onto the slopy staircase part of the moving part with its short end. the long end hooks into the hole and goes under the spring.

the grey frame holds everything together.

"staircase"


hook position