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Locking a ball in a way strong enough so you can put any pressure on the top two feet from center is difficult. It really doesn't need have to be infinitely adjustable, just a set-up with two double acting hinges so it can tip toward both sides and both ends. That way you can get most any combination you need. The trick is figuring out how to lock it.
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The descent of man ~ Nixon, Friedman, Reagan, Trump.
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