The cylindrical shaft of the lug of the second mounting portion has a predetermined diameter that is only correspondable with a slot in {HEAD ~ the second mount} of {TAIL ~ the base} 
The cylindrical shaft of the lug of the second mounting portion has a predetermined diameter that is only correspondable with a slot in { HEAD ~ the second mount } of { TAIL ~ the base }
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 HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL