What if the magnets came out of the rings?  How can I put them back in correctly?

Answer:  The + side of the ring repels the + side of the other ring.  So you just put the + sides of the 2 rings together, and they should push apart from each other.

These 2 rings should push each other away.

The + side of the ring also should repel away the + side of the foot brace.  So all you have to do is put the magnets back into the rings so that + side repels away + side.  The side that has nothing should also repel away the side that has nothing. 

The + side of one ring attracts to the nothing side of the other ring. 

Then glue the rings back in with rubber glue.