{TAIL ~ This sub assembly} is preferably provided with funnel shaped apertures to lead the electric leads of a number of gun electrodes through {HEAD ~ the insulating plate} 
{ TAIL ~ This sub assembly } is preferably provided with funnel shaped apertures to lead the electric leads of a number of gun electrodes through { HEAD ~ the insulating plate }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD