The frame substructure is situated substantially entirely on one side of {HEAD ~ a perpendicular bisector} dropped from the shaft to {TAIL ~ a base}  
dropped to
The frame substructure is situated substantially entirely on one side of { HEAD ~ a perpendicular bisector } dropped from the shaft to { TAIL ~ a base }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH