Home-Made tool for holding viscous fan clutch??

[Abner Mality]

Will be replaceing the fan clutch on my '90 420SEL as soon as the new part arrives. Interested in what other members have had success with as a replacement for the MB tool that holds the clutch while the 8MM hex-head nut is loosened. This matter needs to be addressed as soon as the new clutch arrives, and I'd rather not have to order the part and wait any longer than necessary. Thanks in advance, as usual.