{TAIL ~ A foot bar support assembly} movably carried by {HEAD ~ each} of the outwardly open slots supports the foot bar 
{ TAIL ~ A foot bar support assembly } movably carried by { HEAD ~ each } of the outwardly open slots supports the foot bar
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH