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