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