{HEAD ~ A first lower case member} open at {TAIL ~ the top} thereof supports a magnet therein for establishing a magnetic field oriented parallel to a central axis of the lower case 
{ HEAD ~ A first lower case member } open at { TAIL ~ the top } thereof supports a magnet therein for establishing a magnetic field oriented parallel to a central axis of the lower case
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL 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