First time poster/noob. I managed to lose one of the spring-loaded plungers which are used to transfer presses of the graflex faux-circuit board to the momentary aux switch.

I’ve kludged together a temporary fix using some parts on my workbench; however, I’d like to replace it with the proper plunger.
Two questions: 1) What is the proper part name for the spring-loaded plunger, and 2) is there a source for such a replacement part?
Thanks!