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