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I use a 13/16 lug nut to set the proper distance when using original Ford clutches. Unfortunately that dimension, and the dimension for the spring, are irrelevant if you have the Turbo 400 clutch discs. You probably just need to try and tighten the three clutch tension screws 1/2 turn and try it. When the Turbo 400 discs fail you can install original Ford clutch disks (or modern replicas) for best results.