A predetermined number of pilot holes 164 may be drilled into the side edge 48 of {HEAD ~ the inactive door} 24 at {TAIL ~ several predetermined locations} 
at
A predetermined number of pilot holes 164 may be drilled into the side edge 48 of { HEAD ~ the inactive door } 24 at { TAIL ~ several predetermined locations }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL