Pilot air screw on qt50

nick /
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Hey guys i recently took apart the carb on my yamaha 1984 qt50 for cleaning and realized that the pilot air screw was completly missing. I ordered a new screw and spring from the local dealership and now i find that the screw does not fit whatsoever. It looks as if there is no threading for it to screw into and im wondering if that part may have broken off. Anybody ever hear of this happening?? Also at the end of the pilot air screw hole there is no opening. It looks as if there was but something is stuck or broke off in it. Please any help here would be a huge help.

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