hi guys. i have carb kits for a 60 esl 1970.there is one part that seems not to fit right.it is called the bearing needle valve. it is a small plastic cone that goes over the needle.mind you i am not talking about the retainer that seats at the base of carb. this part i am in qus of goes deep into the carb were the needle seats.when i go to screw the needle in the plastic cone seems not to let the needle catch threads.i gave a little tap on the needle and it found threads. just seems to me it is a odd fit. when i tore the 3 carbs down only the center carb had this part in it. can some one tell me if i am doing something wrong.or do these bearings even need to be used on this aplication . there are a few extra parts in this kit that are not needed on my carbs.may these be added to extra pieces. thank you tony