great work!! you can also slot one bolt hole so other than square shapes can be held by pivoting 1 or both jaws. additionally anther clamp with "jack screw" can be made so you can tighten the clamp more. even additional stops can be made for location and keeping things in the right position when they may not be square and may want to move when tightened.not hard just a bolt on 90 degree angle that fits right up to the edge and bolts to the top.or a a sliding U shaped piece with pinch bolt/thumb screw on the back side.
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