You can easily extend the reach of F-style clamps by adding a pair of long wooden jaws.

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You can easily extend the reach of F-style clamps by adding a pair of long wooden jaws. That idea has been around for a while, but there's a problem: The jaws will bind under clamping pressure. To prevent that situation, the distance between the wood jaws at the clamp bar has to be at least the thickness of the clamped workpieces. To make that happen, add a 14 " threaded rod, nuts, and washers to the wooden jaws.
—Bill Tumbleson, Halstead, Kan.