Technical Meedle in Carter WDO carburator

This needle, What is it for. And where does I belongs in a Carter WDO. It is for a 1948 olds.
It is not to the float....

 

Maybe check needle for accelerator pump

 

I think so to, is the place for it below the screw

 

btt

 

Maybe you should carefully take your carb apart and see if you can find a needle valve like
that inside.
It is possible that the carb rebuilding kit supplied an alternate inlet needle valve so the
kit could be used on another similar carb with a different float valve.

 

Under the meedle screw?