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