{TAIL ~ At least one glow rod} has a contact part that is spring mounted at {HEAD ~ the glow rod} in an axially displaceable fashion 
{ TAIL ~ At least one glow rod } has a contact part that is spring mounted at { HEAD ~ the glow rod } in an axially displaceable fashion
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH