On some small cdroms i use small pieces of card between the magnets to stop them jumping together,when im happy with the placement i put a drop of Loctite Black max on each end of every magnet then chuck it in the Dremel hold it inside a toilet roll tube and spin it for a min' or 2,this forces the locktite to even out and mantain ballance as well as fill behind mags'. When cured trim any excess card flush with mag's with scapel then clean up with cotton bud lightly dipped in laquer thinner. It will surprise you how well this works, just check what is spun out inside the tube .
Black max is good to 100c by the way. Good thread starter too Ron .cheers all.