It seemed like I couldn't get the knob tight enough on the 2007 vintage X2 I just bought. Cleaned up the black plastic wedge piece and the metal track with soap. Then I scrounged a collection of steel washers. With one of them between the knob and the black wedge I was able to get the lean steer mechanism just about tight enough by hand.
Has anyone tried using a metal file to rough up the surface of the metal track to get more friction? I don't have a lot of hope. This mechanism seems poorly designed.
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