I don't have a picture but the best way to think of a mechanical switch. Take a pen that you have to push down and clicks to keep the pen out then click again to put the pen away.
You need away to connect the two + or - to complete the circuit . Maybe spring loaded even magnetic . Example look at the ggts switch nuts bolts washer and spring .
I have been working on a wooden mechanical switch for my mod just not having luck with the size , I will be trying magnetic as soon as the magnets get in