Hello all......hoping for a quick hitter here. Just finished a Genesis 330 fliperoo....Doing last minute tests and tuning burner tubes...leak testing regulator ( it failed ) and noticed the first knob is not at the 12 o clock position. Note this is not the standard bent brass shaft or even the slide to the left or right. The knob is just slightly off dead center. Before I crack into it tomorrow maybe one of you guys have fixed this before. My first guess is that the small brass pin may have chipped the inside of the valve rail or the brass pin itself might be bent. Orrrrrrr maybe a dried grease blob stopping the return to 12 o clock? Of course I will open the valve tomorrow but thought I would pick your brains so when I wake up and check replies I might be able to enjoy my coffee. 
Ohhhh or the knob itself is partly stripped.....easiest of all but I dont think so.
Ohhhh or the knob itself is partly stripped.....easiest of all but I dont think so.