{HEAD ~ a sleeve} having {TAIL ~ a pair} of inner teeth gears engaged with said outer teeth gears for transmitting power between the rotary shafts 
{ HEAD ~ a sleeve } having { TAIL ~ a pair } of inner teeth gears engaged with said outer teeth gears for transmitting power between the rotary shafts
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH