The eccentric discs 213 and the cranks 223 are all mounted with {TAIL ~ their lines} of throw, in parallel and {HEAD ~ parallelism} is maintained as the cranks 223 and eccentric discs 213 rotate 
The eccentric discs 213 and the cranks 223 are all mounted with { TAIL ~ their lines } of throw , in parallel and { HEAD ~ parallelism } is maintained as the cranks 223 and eccentric discs 213 rotate
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH