55-59 factory brake light switch........how do they work?

[NW Task Force]

Hey folks,

I installed an aftermarket under cab brake unit. The brake pedal lever actuates the same as the factory brake lever. My original brake switch is mounted on the bottom of the firewall and is disconnected. How exactly does this switch come into contact with the brake lever arm to activate it? I would really like to see some pictures of how it works. Thank you.