The adjustable clamp fits standard vertical and horizontal rails with diameters from 7/8” to 1-1/8”. Open the clamp as shown and position against the rail.
Close the clamp.
Move the blue lever into position. Be sure the black washer is in contact with the lever. Rotate the blue lever clockwise until the desired amount of clamping force is achieved. Do not over tighten the clamp.
Close the blue lever as shown to secure the clamp in position.