Each foot bar support assembly has an elongated slide plate movably supported within the slot, a hook plate fastened to the slide plate, and {HEAD ~ a foot bar support arm} rotatably and slidably fastened to {TAIL ~ the hook plate} 
Each foot bar support assembly has an elongated slide plate movably supported within the slot , a hook plate fastened to the slide plate , and { HEAD ~ a foot bar support arm } rotatably and slidably fastened to { TAIL ~ the hook plate }
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 HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL