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