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