These switches are like the targets used to score points. Any rubber between 2 pins can be used for this switch.
You can see one on the right side, between the red pins and behind the dodgy rubber band.
This switch is a variant of the target switch and the below playfield part is the same.
It uses a longer metal spring compared to the target. The blue part is the rubber band. Grey is the spring steel lever.
View from the other side.
Switch mounted on a test board. The metal tab is made of spring steel. It is inserted in the plastic pivot part.
View from the bottom