Step 1: Install the handlebar base or rear-view mirror base to the motorcycle.
Step 2: Loosen the special anti-theft screw on the double socket arm, and then loosen the knob of the double socket arm.
Step 3: Insert both balls simultaneously into the double socket arm.
Step 4: Install the special anti-theft screw to the double socket arm.
Step 5: Tighten the knob of double socket arm after adjusting the angle. Installation Complete.