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