Specifically, drive mechanism 70 comprises a drive shaft 72 connected on one end to the crankshaft of the engine, and having {HEAD ~ a drive} coupling 74 on {TAIL ~ its other end} 
Specifically , drive mechanism 70 comprises a drive shaft 72 connected on one end to the crankshaft of the engine , and having { HEAD ~ a drive } coupling 74 on { TAIL ~ its other end }
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 REL OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL