The screws on the head arm are quite small, and so I shall have to purchase a miniature screw driver to remove the arm. Beneath it there appears to be a small spring, so I will likely need to make a trip to the hardware store to purchase a new spring for replacement. This spring appears to pull the arm down from below. OR, I could do something weird and glue a spring on top of the arm to press it down, such as is the case on a newer SuperDrive in the Quadra 605.