arcuate portions continuously formed with {TAIL ~ said one planar portion} and matched to one of said arcuate portions of {HEAD ~ said elongated mating member}, 
arcuate portions continuously formed with { TAIL ~ said one planar portion } and matched to one of said arcuate portions of { HEAD ~ said elongated mating member } ,
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH