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