I just got this alt rotor tool from a guy in the U.K. It's nicely made, but I decided to modify it slightly. I drilled/tapped 4 holes which I lined up with the magnet lines. Then I used steel bolts (extra M8x1.25 from the clutch housing). I just finger tighten them so they contact the surface and the magnets are strong enough to hold it in place with no worry of slipping during torquing.
here is a link to the ebay page:
and some pics,
Robert
