In 2007 the Rack posts had a 9" diameter disk on the end; with tubes having a 10" ID, many teams decided that a manipulator that gripped the inner diameter of the tube would interfere with placing tubes on the rack. Thus we saw a lot of teams with grippers, and not as many with inner-diameter-grabbers.
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Originally Posted by AcesJames
As you can see, the wrist and elbow joints of the arm folded allowing the manipulator to fold into the frame perimeter.
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Nice photo, thanks. I see what the upper elbow joint is made of, but can you describe the lower elbow joint for me?