It's normal from them to do this occasionally when there is no load on the shock (fully extended). Also be sure that you have gas pressure. But you could have some dirt or debris inside the adjuster knob that is keeping the pin from moving down. Take it apart. It's a pretty simple setup. Here's an exploded view if you're unclear on how it works: http://www.resuspension.com/assets/L...on%20Shaft.pdf
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