{HEAD ~ Threaded bolts} 16 can be screwed into bores 15, and bolts 16 extend through and are fixed against lateral displacement by an outwardly projecting flange of collar 27 of {TAIL ~ door body} 6 
{ HEAD ~ Threaded bolts } 16 can be screwed into bores 15 , and bolts 16 extend through and are fixed against lateral displacement by an outwardly projecting flange of collar 27 of { TAIL ~ door body } 6
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 OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH