The set of {TAIL ~ drive gears} is mounted on a drive shaft and comprises the gears having different diameters which {HEAD ~ all} rotate together with the drive shaft 
The set of { TAIL ~ drive gears } is mounted on a drive shaft and comprises the gears having different diameters which { HEAD ~ all } rotate together with the drive shaft
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH