I recently cleaned my carb for the first time and appear to have lost a part in the process. The throttle cable cover (name? - its on the "brakes" side while installed on the bike) now has a small gap near where the cable goes in, I believe there was a black rubber piece there. I tried consulting the parts diagrams available online but haven't had luck locating it. A name for this part or the number on the diagram (there seems to be a generic one that most sites use) or even a link would be a huge help to me. Thanks in advance.