Gently lift the top half of the plastic housing. If it sticks, do not force it. Check if you missed a hidden screw, particularly around the base plate area. Carefully lift the top casing straight up to avoid disturbing the internal components. 3. Take a Photo Document
The lever for "Pendulum action" (usually 0-3 or 0-4) won't move, or is stuck in one setting. Fix:
are dealing with common wear-and-tear issues. Here is how to resolve them: