A hole in the pivoting ball top extension accepts a pin, and {HEAD ~ the hole} is situated with {TAIL ~ respect} to the frame such that the pin will be against the frame when the pivoting ball support face is in its first position 
is situated with
A hole in the pivoting ball top extension accepts a pin , and { HEAD ~ the hole } is situated with { TAIL ~ respect } to the frame such that the pin will be against the frame when the pivoting ball support face is in its first position
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH