A chair is coupled to the shaft by chair coupling member ; {TAIL ~ a device carriage} is coupled to {HEAD ~ the shaft} by a carriage coupling member ; and a footrest assembly is coupled to the shaft by a footrest coupling member  
A chair is coupled to the shaft by chair coupling member ; { TAIL ~ a device carriage } is coupled to { HEAD ~ the shaft } by a carriage coupling member ; and a footrest assembly is coupled to the shaft by a footrest coupling member
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH 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