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