{HEAD ~ The bracket} is {TAIL ~ a curved sheet} positioned around at least a part of the truncated cone and having an adjustable bracket diameter 
is
{ HEAD ~ The bracket } is { TAIL ~ a curved sheet } positioned around at least a part of the truncated cone and having an adjustable bracket diameter
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH