2005 cr 125 air screw ?

trying to get a 2005 cr 125 running. I am going through the carb and there does not seem to be an o ring associated with the air screw. Is this correct. I don't see one in the parts schematic either. 

16016-KZ4-A92 SCREW SET A on Partzilla doesn't show one either....just the screw and a spring.

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