That tool is WAY overpriced in my opinion, and not necessary. I personally use a piece of wood (mallet hammer handle) and wedge it up in there so the flex plate(?) won't turn. You have to remove the small plastic cover to get inside the bell housing.

Works like a charm!

Good luck

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-Paul-
'01 E430, Sport 72,000 mi
'98 C280, 126,500 mi