{HEAD ~ each} of said sockets has {TAIL ~ a cam member} contained in the other of said pair of holes, and 
has
{ HEAD ~ each } of said sockets has { TAIL ~ a cam member } contained in the other of said pair of holes , and
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH