If one quadric crank chain is used, {HEAD ~ the rotary center shafts} may be formed to extend along {TAIL ~ a substantial length} of the center axes 16C, 18C, 22C and 24C 
If one quadric crank chain is used , { HEAD ~ the rotary center shafts } may be formed to extend along { TAIL ~ a substantial length } of the center axes 16C , 18C , 22C and 24C
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH