The rolling elements are arranged at the vertices of a triangle with {HEAD ~ respect} to {TAIL ~ a plane} that is parallel to the guides 
to
The rolling elements are arranged at the vertices of a triangle with { HEAD ~ respect } to { TAIL ~ a plane } that is parallel to the guides
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