FWIW, I use a modified Tilton concentric piston hydraulic throwout system from dirt track racing and discard all the mechanical linkage in and on the bellhousing. This method is not without its own problems though, since if ANYTHING goes wrong, the ZF must come out of the car to adjust or repair. A few U.S vendors used to sell such systems years ago, but they are difficult to set up correctly. Set incorrectly, they will leak and warranty returns killed that market.
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