{HEAD ~ The pins} may be engaged into {TAIL ~ the notches} of the base for securing the plate at the vertical position 
{ HEAD ~ The pins } may be engaged into { TAIL ~ the notches } of the base for securing the plate at the vertical position
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH