I thought I'd take a few pics (although really FLC quality) as a supermag schematic doesn't seem to exit.
Lever the brass bearing housing from the old side plate with a knife/flat head screw driver then press into the new side plate with your thunb against the side of a table:
Put two magnets in each magnet hole (one each side of the magnet carrier - there is a little narrowing which stops the magnets falling out). Don't put two magnets in one side. Make sure all the magnets are facing the same way so that the two magnets hold each other together. Easiest way to put the magnets in is to put the stack of magnets in the hole and push the rest of them to the side so one stays in the hole.
