The devices have a body with {HEAD ~ a button member} extending into the body and having {TAIL ~ protrusions} locking therein using a form of bayonet lock 
having
The devices have a body with { HEAD ~ a button member } extending into the body and having { TAIL ~ protrusions } locking therein using a form of bayonet lock
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH