Joe Lyddon,
Look at the jpg that is laying on floor, the last one, see the black knob in the slot?
Here is operation lossen the tightening adjustment (countertclockwise), insert the item to be clamped. With the adjustment knob (the one in the slot), move to clamp item. To clamp it turn the tighting adjustment knob (clockwise) which will tighten the clamp.
Bud
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The Geezer
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