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How do you get the thumb screw open to attach it to the matt and to enable you to put the ball joint in - screw turns round but doesn't do anything 8 Apr 2014
The thumb screw twists anti clock wise to open. The thumb screw twists on a threaded screw under the ball joint and into a nut directly opposite the thumb screw on the ball joint housing. I'm sure the joint was already attached to the matt when I bought mine. Have you referred back to the person you bought it from?
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