In {TAIL ~ some positions} {HEAD ~ three or four rollers} 91 and 92 will engage the cam gears 
In { TAIL ~ some positions } { HEAD ~ three or four rollers } 91 and 92 will engage the cam gears
REL TAIL TAIL TAIL TAIL TAIL TAIL HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH