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