{HEAD ~ a deformable connecting interface} between {TAIL ~ the axle} and the guide arm which, because of a deformable nature, facilitates lateral displacement of the axle relative to the guide rail ; and 
between
{ HEAD ~ a deformable connecting interface } between { TAIL ~ the axle } and the guide arm which , because of a deformable nature , facilitates lateral displacement of the axle relative to the guide rail ; and
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH