The Stock air adj. screw seems to have a cap/plug over it with a small hole to reach the screw in side with a small flat blade screw driver. I bought the new screw and it say to "consult your mechanic" if unsure what to do. Ok, can anyone help tell me the best way to get the cap off? It does not come out when the screw is backed out, nor easy to pry off/out from the hole. Thanks.