I've just been reading through this thread as I have recently obtained a multipack of Easi-shunts and I have been experimenting with them. As many here have mentioned, the Dapol magnets are both LARGE and rather expensive. Others have tried using small neodymium magnets in various arrangements so I bought a pack of fifty 3mm wide by 2mm thick disc magnets (0.27kg pull). Now four of these in a stack, lying down, will just fit neatly between the tracks of Peco N gauge code 80 track and between the sleepers! In other words, no cutting of sleepers required! Of course, being 3mm across, the magnets are proud of the sleepers which are about 2.5mm thick, but all you need to do is to cut out a bit of cork underlay (my track happens to be on 1mm mount card) and the magnets can be pushed down between the sleepers and made flush with them (perhaps with a bit of packing). There's enough of a gap at the ends of the stack to ensure it doesn't short the track out. Four magnets in a row across the track gives plenty of oomph to move the pins and I find this works 100% reliably. Even without painting they don't stand out, but a touch of mucky track colour and they should disappear almost completely. The only downside is that the effective uncoupling area is rather small so you have to be quite accurate with your shunting. But the cost is a fraction of the Dapol magnets. A stack of four magnets costs less than 70p! You can't argue with that!