Lifting the brass lever opens the jaws of the clamp.
(The wide slot around the lever allows the lever to shift in a slight counterclockwise fashion to accommodate a jaw opening of over 2 inches.)
Easily slip the clamp over the edge of the backing and bring the jaws together by pressing the brass lever toward the top jaw.
When the lever is pressed to bring it parallel to the jaw it will be latched and firmly gripping the backing.
The vertical backside of the jaws between the edge and the first hinge has a taper that allows the backing to curve through the back edge of the clamp in case the top or bottom of the backing has a sharp curve.
Bring the Velcro (loop surface) strap over the side of the stand frame and give a moderate pull. Then lower the strap to hook into the Velcro (hook surface) on the frame.
When ready to roll the quilt and reposition, just lift the brass lever to release the clamp's grip and set the clamp on the table surface.
After rolling the quilt, just reposition the clamp on the backing and latch it. You are ready to resume quilting.
The strap does not need to be adjusted because you reapplied the tension when you brought the clamp back to the backing.