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Thank you for allowing me to assist you, my name is Joe and I will be happy to assist you with your concern today.
You do not have many options here, you either need to remove things to gain access, have smaller fingers, use a screwdriver (flat blade) to hold it there while you spin it or you will have to remove the carb to put it back into place. A screwdriver/magnet usually does the trick. If you pull the carb you should replace the carb base gasket.
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