Can someone mearusre their F2 air screw o-ring for me? The o-ring that seals the shaft of the screw to the carb. Not the one that is super tiny at the tip of the screw. I know you don't really need it, but would give me some piece of mind. The F2 air screw that came with my bike did not have an o-ring. I would like to order one from mcmaster but don't know the size. I am not near the bike to measure one or can I find the correct size since F2 has evaporated. Much appreciated gang.