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