[USER=2173]@ghost[/USER] notice the supports are only on the left side
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Honestly I don't love it, but it seems to work fine. The weight is constant, and as long as the blade is sharp, there really isn't any change in vertical load. But as an engineer it irks me because the deflection changes depending on the height of the head, so if you get it square down low, it inevitably can't be square up high, and vice versa. But the deflection of a pair of 3x3, 1/4 wall tubes at 4ft with 300lbs on them is probably in the neighborhood of approximately nothing 
