{HEAD ~ A first and second mounting portion} is connected to each of the at least one tool support structure and is connectable to {TAIL ~ a first and second mount} on a base, respectively 
is connectable to
{ HEAD ~ A first and second mounting portion } is connected to each of the at least one tool support structure and is connectable to { TAIL ~ a first and second mount } on a base , respectively
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH