a support shaft fixedly connected with said link and inserted for {HEAD ~ rotation} in said {TAIL ~ fourth or fifth wall} of said housing thereby allowing said link to pivot at said support shaft, 
in
a support shaft fixedly connected with said link and inserted for { HEAD ~ rotation } in said { TAIL ~ fourth or fifth wall } of said housing thereby allowing said link to pivot at said support shaft ,
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH