The spring force is coupled to {TAIL ~ the test member} via {HEAD ~ a movable member} which moves in a substantially frictionless manner 
The spring force is coupled to { TAIL ~ the test member } via { HEAD ~ a movable member } which moves in a substantially frictionless manner
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH