Thus, rotation of the rod 109 will pivot {TAIL ~ the levers} 24 and 25 about {HEAD ~ their pivot point} to change the spacing between the roller 8 and 7 
Thus , rotation of the rod 109 will pivot { TAIL ~ the levers } 24 and 25 about { HEAD ~ their pivot point } to change the spacing between the roller 8 and 7
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH