The extensions each includes a curved surface formed therein for engaging with the protrusions of the stops and for guiding a rotation of the legs of the plate relative to {HEAD ~ the extensions} of {TAIL ~ the block} 
The extensions each includes a curved surface formed therein for engaging with the protrusions of the stops and for guiding a rotation of the legs of the plate relative to { HEAD ~ the extensions } of { TAIL ~ the block }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH 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 REL TAIL TAIL TAIL TAIL TAIL TAIL