Hi Gerd. I'm not sure I understand how the Mag-8000 handles the mulching blades? I can't see how the unit puts the same angle across the wavy edge of the blade. It would seem to me that it would still require some sort of "free handing". Of course I've never used any kind of blade sharpener/grinder, and I haven't seen the 8000 in person either, so it should come as no surprise that I don't understand how it works! lol. Thanks.