The Ultimate 2-in-1 Cam Drive Sprocket Locking Tool for Harley-Davidson. Upgrading your cams?. Don’t risk damaging your gears with a screwdriver or a steel wedge. Our professional-grade Billet Aluminum Locking Tool is specifically designed to lock the primary and secondary cam drive sprockets on Harley-Davidson motorcycles, allowing you to easily remove and install bolts to the proper torque specifications.