As shown best in FIGS 1 and 2, cylinder 1 is in {HEAD ~ the form} of {TAIL ~ a cylindrical, substantially hollow housing} 2 which defines a central longitudinal axis 3 about which cylinder 1 is rotated 
of
As shown best in FIGS 1 and 2 , cylinder 1 is in { HEAD ~ the form } of { TAIL ~ a cylindrical , substantially hollow housing } 2 which defines a central longitudinal axis 3 about which cylinder 1 is rotated
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH