Quote Originally Posted by mizgeorge View Post
Just a thought, but how about attaching them with either a split ring or small bolt ring instead? That would then avoid the heat problem altogether. I'm not normally a huge fan of split rings, but if they're small and discreet, they can serve a useful purpose. A bolt ring would also give the option to remove the magnetic clasp altogether for someone who can't use one (pacemaker, pregnant etc).

I'll get my coat....
I use quite a lot of split rings as i don't solder at the mo. I prefer them to open jump rings.
Split rings can be very useful