Is there a company out there that sells new rocker shafts? I had a pretty loud tapping from the valvetrain.. after doing a valve job about 8 times in a row, I pulled the whole rocker assembly and yanked the rocker shaft.. the thing has massive grooves worn in it and tons of slop b/w the arms. I tried end for ending it, but it is still too worn.. I cant find anyone that makes a new one? Help? OK, second more stupid question.. Ive got a a knob in my 76 40 all the way to the right on the dash thats got a weird symbol on it and looks like a secondary choke cable w/ a little cable attached that a PO cut off in the engine compartment.. what the hell is it? Ive been wracking my brain..