Grinder,
The repair is pretty easy. The plastic nipple assembly is a press fit into the carburetor body. You can usually grab it with a set of slip joint pliers and work it out. Next take a 2” length of copper tubing like is used in the fuel tank and carefully bend to a 90 deg. angle insuring that you do not generate any crimps. I usually bend it around a screwdriver handle or something similar. With a Dremel tool cut off about ¼” of the end that will fit onto the carburetor and bevel the end at about 45 deg. so that it fits the hole nicely. This will keep it from sticking out too far and provide a tight fit for the next step. Next JB Weld the new copper nipple to the opening in the carburetor being careful to keep the needle end pointing toward the needle valve. Be generous with the JB Weld. You may have to sit and hold it for a few minutes while the JB Weld sets up. I have never had one to fail after this repair.