I recently received my order of the Weber Hypojet jackets and 28 thousandths inserts. They arrived safely with no issues to my door. HUZZAH! However I have a question. I understand that the insert can be turned to the desired opening on the jacket for tunability, thus giving me 4 chances to zero in on my correct AFR. My question is this. Is the insert suppose to fit snuggly into the jacket? when I install my insert, it freely spins inside the jacket. When I install the mated pair into the idle jet screw, it freely spins inside of that as well. With no solid tight fit, between idle jet holder, to insert, and insert to jacket, how does the hypojet maintain the correct jet opening orientation? Since it is screwed in, I would think that it would rotate randomly and it would not be consistent at all between jets. Not sure how these are suppose to hold a setting... No other instructions were included, as it is just as simple as insert tab a in slot b like all weber stuff.