a securing plate having {TAIL ~ plurality} of notches, mounted to {HEAD ~ said second free end} of said second arm 
a securing plate having { TAIL ~ plurality } of notches , mounted to { HEAD ~ said second free end } of said second arm
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH