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