[Jeff Rodriguez]

Originally Posted by russell

Edit: What are those little metal finger type things that are laying against the shaft for your arm?

Do you mean these little finger things? (left side of the picture)

Those are limit switches. There will be a collar on the shaft of the arm that will trigger the switch when rotated to a position. We use them to automatically stop the arm from either going too far backward (and falling over) or from ramming the arm into the ground.