so we have a problem with the low-end needle changing/turning in flight on my son's OS 46 FX plane carb, after every flight I have to reset the low-end needle,,, so what's the best fix ??

is there an O-ring on the low-end needle ??, I looked at a carb rebuild kit and I only saw an O-ring for the high-end needle,,,

this motor only has about 12 gallons on it...

thank's !!
Jim