A working piston reciprocates in {TAIL ~ one cylinder} and is conventionally attached to {HEAD ~ a crankshaft} by means of a connecting rod and crankpin 
A working piston reciprocates in { TAIL ~ one cylinder } and is conventionally attached to { HEAD ~ a crankshaft } by means of a connecting rod and crankpin
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH