I started building my wild fire yesturday and I have 2 questions. I was installing the screws on the chassis for the bulk heads and I never heared the screw click or felt a click. How tight do they need to be? Also the carbon peice that I see in the pics on CRC web site for the steering bellcrank is that an option part, I see the instructions don't show to install the part but its just there on the next page that shows how to install the bellcrank on the chassis.