I read all the reviews about this leak but ordered it anyway. Of course it leaked. This is probably because the instructions don't specify how to properly install the gasket. After some trial and error I figured it out. The seal should be on the side of the ball that contacts the tube bore. It is located between the ball and the hole of the tube while the flat part is pressed against the hole. The part you screw on contacts the ball directly - with no spacers in between - and screws into the tube bore, squeezing everything together tightly.
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