Two plastic clips secure each trigger to its hinge.

Carefully pull the trigger away from the hinge one side at a time to detach both clips.

To install a trigger on its hinge:

Make sure the middle section of the spring is looped over the tab on the hinge with the bent ends facing down.

With the trigger on the opposite side of the hinge screw-holes, clip it into place so the coiled parts of the spring are between the trigger clips.

The trigger should compress and spring back when you press it down.