START-UP PROCEDURES TECHNICAL DOCUMENTS TECHNICAL VIDEOS FAQs - Technical What tools and equipment will I need to install a door? What is a QD (2-piece) sprocket and how do I install it? How do I precharge a spring? What do I need to know to wire the operator and control panel? How do I set up a wireless pneumatic reversing edge? What spare parts should I keep on hand? How do I wire the photocells? How do I adjust the brake on an HG operator? How do I adjust the brake on an RG operator?