[Healeys] clutch question

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Can anyone tell me how much force is needed to manually disengage a clutch? I
have just mated my tranny and engine and attempted to work the clutch fork
lever to no avail, the fork moves freely until the release bearing meets the
pressure plate but I cannot move it any further, I even tried a long pry bar
until I was afraid of breaking the fork. I did not install the clutch and now
wonder if it might be defective or installed improperly. Many thanks.

Brad Holden
67 BJ8