Back with a M900 series I

Avanti seem to sell a neat one: http://www.avantiraceparts.co.uk/shop.php?id=3&cat=7

This clutch hub and basket holding tool is so simple yet so effective. Made from solid Delrin, a very tough plastic, it bolts into the clutch cover holes and locks both the clutch centre hub and basket in place, allowing easy assembly and disassembly of the clutch. Because it's made of plastic, it won't scratch your case or clutch hub and basket either! Includes grade 8.8 mounting bolts too.