Any Shen Hao owners had this problem? When I swing the back to the left (counterclockwise) the lock-down lever doesn't seem to tighten it up enough; I can basically move it with as much freedom as when it's not locked down. The problem seems to be that I just can't turn the lever far enough because there's a blocking screw in the way. Swing right works fine.
Any ideas? I'm tempted to just pull the screw out and be careful not to over-tighten in general.