RY2553SS Trimmer - Ruixing Carb H639 - Pac Man?

Murray40Rider

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RY2553SS Trimmer - Ruixing Carb H639. In center of idle adjust assembly is a threaded brass pivot tube. Within tube appears to be a tiny, skinny, very small, pac man screw.
Yes-no? If yes, what to do with it?
Bought a new carb kit from Amazon, a HILOM carb kit. Embossed on carb is Ruixing and Hipa 01233. Identical in every way except no pac man shaped screw. Some other shape. Hmm?
Thanks for your time.
Mike
 
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