As FIG 4 shows, {HEAD ~ the two tensioning cords} 23 in {TAIL ~ the resting position} of the head 3 are angled at a right angle position with respect to the part of the round belt 22 that goes around the pulley 11, without the round belt 22 having left the tracking groove 21  
in
As FIG 4 shows , { HEAD ~ the two tensioning cords } 23 in { TAIL ~ the resting position } of the head 3 are angled at a right angle position with respect to the part of the round belt 22 that goes around the pulley 11 , without the round belt 22 having left the tracking groove 21
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH