a plurality of magnets attached to {HEAD ~ said inside surface} of {TAIL ~ said case} at spaced circumferential locations around said inside surface, said magnets being charged so that their poles are radially aligned, 
a plurality of magnets attached to { HEAD ~ said inside surface } of { TAIL ~ said case } at spaced circumferential locations around said inside surface , said magnets being charged so that their poles are radially aligned ,
OTH OTH OTH OTH OTH OTH 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