Andy, If you are familiar with metal shapers, these are commonly used work holders to enable planing the entire top surface of a workpiece. They are essentially a four sided shape. The jaw side and the bottom side are square, with the workpiece side angled at about 2 degrees from the jaw side. The upper edge sticks into the work so that when the jaws are tightened, it not only clamps the work, but also drives it downward. The top surface is simply sloped downward to provide clearance for the tool bit. These can easily be made on a shaper, or on a mill with the appropriate angle plates. Starrett still makes them from what I understand, but if you don't care about a ground finish, shop made would still do fine.
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