After a frustrating time attempting to get the Dapol SHORT Easi-shunts to work with rare-earth magnets (the LONG ones worked reasonably), I've tried the Dapol magnets; I cut 7 sleepers away with a slitting disc (on the slowest speed to avoid a meltdown) and placed the magnet in position. Result--success! I then cut the magnet in half, resting on a piece of wood, again with the slitting disc and snapping it when a decent groove had been made. The couplers still work, plus you then have 2 magnets for the price of 1 and only 4 sleepers need removing. The appearance isn't bad either, but I'll experiment with a layer of ballast on and around the magnet to see the effect before installing in the goods yard.