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