I forgot to mention that not only do I use a small square during setup but also a caliper to measure the height of each side. That way I get the top parallel with the bottom. ~~~~~~~~~~~ <My primary objective is to keep the key bottom flat on the sled. The sides of the keys are not an accurate reference to squareness from one key to the next, and therefore generally don't make a good clamping surface, -- Regards, Jon Page
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