It is thus possible to compensate {HEAD ~ unavoidable tolerances} in the spacing between the free end 21 of the glow rod 20 and the face 4 of the filter body 2 with {TAIL ~ the aid} of the spiral spring 26 
with
It is thus possible to compensate { HEAD ~ unavoidable tolerances } in the spacing between the free end 21 of the glow rod 20 and the face 4 of the filter body 2 with { TAIL ~ the aid } of the spiral spring 26
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH