As can be seen in FIGS 1 and 2, close to {TAIL ~ the upper portion} of the pivot 19 is a cylindrical section 25 off centre with respect to the axis of rotation of {HEAD ~ the pivot} 
As can be seen in FIGS 1 and 2 , close to { TAIL ~ the upper portion } of the pivot 19 is a cylindrical section 25 off centre with respect to the axis of rotation of { HEAD ~ the pivot }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH 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 HEAD HEAD HEAD HEAD HEAD HEAD