Magic!
I mean, umm.
Magnets:
I would mark each positive side with a black marker pen, so you can always tell whcih way to glue them. Then get a drill bit the same size as you magnets, and drill a hole. Then superglue one magnet in.
You can then allign the other side and glue that in. Just make sure the magnets attract - not repel.
Ogryns:
Do something like this!
Rough Riders:
Do this!