The optional cover 14 can enclose {TAIL ~ this edge} 60 or {HEAD ~ the edge} 60 can be exposed 
The optional cover 14 can enclose { TAIL ~ this edge } 60 or { HEAD ~ the edge } 60 can be exposed
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH