hey all, i'm getting ready to replace the o-rings and injector seats on my 16v. already pulled the injectors off as well as the manifold. got the brass plugs off and cleaned off the threads and grooves. anyway, i found the caps on 2 injectors in the head. i'm guessing these caps need to come off to change both o-rings. anyone got tips on doing this. i'd appreciate any help on this. tia. mp