1. Before mounting, set the side plate (adapter) onto your equipment; 2. Slide the scope mount onto side plate adapter; 3. Unlock the locked lever (when the button faced outward) by pressing the button lower part while rotating the lever; 4. Press down the spring-loaded part to rise the adjustment screw; roll in/out screw to adjust tightness; 5. Lock the lever when the scope mount is properly tightened.