The shift cam with the shift cam return spring installed. The tip of the screwdriver is pointing to the hole where the tab from the spring connects to the cam. The other tab (pointing toward the center of the cam) fits into a slot in the cam pivot.

The shift cam with the shift cam return spring installed.  The tip of
the screwdriver is pointing to the hole where the tab from the spring
connects to the cam.  The other tab (pointing toward the center of the
cam) fits into a slot in the cam pivot.