{HEAD ~  a tool} mounted in {TAIL ~ said tool holder} and having an axis parallel to said longitudinal axis 
mounted in
{ HEAD ~ a tool } mounted in { TAIL ~ said tool holder } and having an axis parallel to said longitudinal axis
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH