Switch Button
Removing the switch button from the pin holder housing can be a test of your patience. Using a paper clip or the spring from the switch actuator can help but still takes some practice.
Try this tip:
Drill a 1/16” hole in the pin holder as shown in the photos. This will give you easy access to the retaining clip in the future.
Carefully remove the point from a push pin, this will now be a handy tool for removal of the switch button.