Let the magnet snap onto the other one first so you know the orientation, nothing worse than gluing a magnet in backwards. Line the magnet up where it's supposed to go, place a few drops of JB Weld on the back of the magnet and slide the battery cover on straight. Put a big rubber band around the mod and leave it there for 24 hours.
Or you can use tweezers to put the magnet back in place on the cover instead, but be aware of the polarity.![]()
Fortunately it’ll only go in one way. Which also makes it very very fiddly. Make sure to get it lined up right before trying to glue it. I put it in first, and just dabbed the glue around the edges where the magnet meets the back.