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