Step 2: prepare the magnets
One mini pack is enough to do about 3 sets of these or you could do this with some spare sugru form another project...
1: Break the sugru into 3 equal pieces.
2: break one of these pieces in half.
3: shape these pieces into small cones.
4: Press the pointed end onto the sides of each magnet;
One piece onto the plus side of one magnet.
The other piece onto the minus side of the second magnet.