To adjust the tension of the spring: Note: adjusting the tension of the spring is very important! The size setting will affect your ride 1. After installing the damper, push the anti-collision body on the main axis to the bottom of the main tube. 2. Ride on the vehicle in normal sitting position (do not move up or down with force); 3. Observe the distance when you get off the car and the collision prevention body is pressed back. If the normal spring force is about 15mm 5. If the force is lack of prediction (collision prevention body is pressing backwards at least 15 mm), use the adjustment wrench to rotate downward (clockwise) to increase the prediction. After adjustment, return to step 2 and measure again. After adjusting, please firmly fix the top fixing plate. Pressure Adjustment: When the product was shipped, a professional technicians have adjusted the barometric pressure to accommodate the damper. Dampers are filled with high pressure nitrogen gas, so it is dangerous to adjust themselves. Note: (Please do not adjust it for self-safety)