I'm know well enough that a PMM cannot be made. The best thing to do is to stop regarding it as such and concentrate on a different aspect of it - for example, overcoming or negating the "point zero" momentum loss in a cyclic magnetic system. If it is possible, via nothing but creative design, position magnets in such a way that the zero point has no reverse effect, a magnarotor is possible - either as a reasonably long-lived energy medium if permanent magnets do lose their charge at a significant rate, or as dependable heavy-duty fixed-rate torque generators for powerplants if not. Yes, I can see my credibility go right through the rock bottom with this, but if you don't consider it a perpetuum mobile, it remains a viable idea. Yes, I have looked into the matter, I have seen some of the patent designs for such machines, but none of the ones I've seen are close enough to my vision of the thing. Of course, it's very likely that it doesn't work the way I think it should even with all the considerations I take for field strength, shape and other parameters, or maybe the position I'm looking for is possible, but cannot be maintained in a working mechanism for whatever reason. I'm both optimistic and pessimistic at once - I realize it has all the chances of not working, considering all the research that should have been put into it if it was possible (note the "should have been"), but I have a habit of trusting my own judgement if it takes all known variables into account.