Here are a few pictures that might help someone.
I couldn't get my iphone well focused on the contacts.
Picture 1 - Overall Parts
Balls sit in the valley between the two small tabs. Held in place by the end of the springs.
Picture 2 - Close Up of Switch Base
Bending the base to get the contacts out - be careful to bend things as little as possible. Getting the contact back in without bending things too much is not easy.
Picture 3 - Moving part contact location - out of focus
Picture 4 - Base Contact Location - out of focus
I "cleaned" the contacts by burnishing with the tip of a small screwdriver.
