injecting {HEAD ~ molten synthetic resin} from a cavity gate in at least one of said molding blocks into said first and second recesses and also in said openings in said base plate for entirely filling the cavity with said molten synthetic resin for forming {TAIL ~ said projection} and integrally forming within said second opening, adjacent to said projection, a frame member of synthetic resin having a hole therein; and 
injecting { HEAD ~ molten synthetic resin } from a cavity gate in at least one of said molding blocks into said first and second recesses and also in said openings in said base plate for entirely filling the cavity with said molten synthetic resin for forming { TAIL ~ said projection } and integrally forming within said second opening , adjacent to said projection , a frame member of synthetic resin having a hole therein ; and
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH