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