The second pulley and the tool lie on {TAIL ~ the same rotation axis}, so that when the head is in a position rotated at an angle of {HEAD ~ 90°} to the longitudinal axis of the instrument, both pulleys lie in the same plane 
The second pulley and the tool lie on { TAIL ~ the same rotation axis } , so that when the head is in a position rotated at an angle of { HEAD ~ 90 ° } to the longitudinal axis of the instrument , both pulleys lie in the same plane
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH