The plate has {HEAD ~ a viewing hole} juxtaposed in {TAIL ~ visual alignment} with the burner for visual confirmation of flame ignition 
juxtaposed in
The plate has { HEAD ~ a viewing hole } juxtaposed in { TAIL ~ visual alignment } with the burner for visual confirmation of flame ignition
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH