In {TAIL ~ some embodiments}, {HEAD ~ grooves} 350 and 352 are annular threaded grooves and flexible electrical connectors 322 and 324 include threads such that the connectors 322 and 324 can be screwed into grooves 350 and 352 
In
In { TAIL ~ some embodiments } , { HEAD ~ grooves } 350 and 352 are annular threaded grooves and flexible electrical connectors 322 and 324 include threads such that the connectors 322 and 324 can be screwed into grooves 350 and 352
REL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH