{HEAD ~ A spring} on the other end of the collette presses {TAIL ~ the collette} against the shell to produce wiping contacts at the opening 
presses
{ HEAD ~ A spring } on the other end of the collette presses { TAIL ~ the collette } against the shell to produce wiping contacts at the opening
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH