{HEAD ~ The cantilevered, or similar, design} is critical to provide {TAIL ~ the design} which allows for the separation between the cathode and the insulator ring 
is critical to provide
{ HEAD ~ The cantilevered , or similar , design } is critical to provide { TAIL ~ the design } which allows for the separation between the cathode and the insulator ring
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH