Gday Bruce, cheers for the quick reply. Had a quick squiz at the manuals and parts list area and I got this UBB error "Access denied to this forum. This forum is either restricted to a certain group, or you may need to register and login in order to view the posts within." As for the primer cap, I dont believe this is the part that is damaged, rather the black parts where the lines follow to the cylinder and then just above the base. The nipples that are broken are both black, if that helps.