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