The terminating edges of the inward projections 15 from a center opening 14 of a diameter slightly smaller than {TAIL ~ the outside diameter} of {HEAD ~ a hollow shank}, designated at 19 in FIG 5, of a button body 
The terminating edges of the inward projections 15 from a center opening 14 of a diameter slightly smaller than { TAIL ~ the outside diameter } of { HEAD ~ a hollow shank } , designated at 19 in FIG 5 , of a button body
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH