The components which define the three points of engagement with {HEAD ~ the test member} are mounted on {TAIL ~ this frame} 
The components which define the three points of engagement with { HEAD ~ the test member } are mounted on { TAIL ~ this frame }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL