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After a little experimentation with a magnet I had to hand (actually inside my Touch cover), I think it might be possible to do it by sticking the magnet to a smallish piece of steel sheet, both of which go inside the front cover. Then the "magnet side" should trigger the on/off switch, and the steel panel side should suck up the magnetic field once the front panel is flipped around so that it doesn't trigger the on/off switch. I'm not sure how small I can make the steel panel and still have it work, but I would cautiously estimate that it should be possible to do it with a piece no bigger than a 1" square wafer (maybe 1/40th of an inch thick or so). Maybe a lot smaller will do. The main thing is that it's a magnetic material (eg steel).
I'm not sure a weaker magnet will solve the problem by itself, as I'm pretty sure that the magnetic switch is *under* the screen, so if anything the magnet is likely to be closer to it once the cover has been flipped around to the back.
I suppose it might have been easier if Kobo had made the magnetic switch sensitive to only one magnetic pole. Apparently Apple do this.
Ah well. Got a new cover and some mini magnets on the way, so will have a fiddle and report back...
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