Pins associated with {HEAD ~ the housing seat} through {TAIL ~ selected apertures} in the bar at a determined position 
through
Pins associated with { HEAD ~ the housing seat } through { TAIL ~ selected apertures } in the bar at a determined position
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH