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Aprhockey- I can easliy see why you're unhappy with your jig's stability and adjustments. Taking some of the dimensional points off the ends of what is a narrow width "c" shape is ripe for movement in all planes. Any way to close the "c"? "Window frame" jigs have been used for decades with good results. You are only a bit of 8020 extrusion length away from closing up the "c" and gaining a lot of stability and consider doubling the extrusion's cross section while you're at it. Andy.