A boot 1, wherein the said end of the lever is formed as a round ended lip for {TAIL ~ engagement} with {HEAD ~ said fixed seat} 
A boot 1 , wherein the said end of the lever is formed as a round ended lip for { TAIL ~ engagement } with { HEAD ~ said fixed seat }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD