The geometry of the circumferential ridge or {TAIL ~ groove} can optionally be modified to increase or decrease the amount of force required to effect {HEAD ~ insertion} or removal of the ferrule inside the cavity 
The geometry of the circumferential ridge or { TAIL ~ groove } can optionally be modified to increase or decrease the amount of force required to effect { HEAD ~ insertion } or removal of the ferrule inside the cavity
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH