Thread creep alert!
Fullers Earth will also dry up the oil on your clutch (in your car!) and get you home in an emergency, but you'd better be an experienced driver, with mechanical experience. Your Bendix gear will probably block up and the clutch will be instant, either in or out, no slip at all. Getting it in there is not for a tyro, either.
The get-you-home tricks that my dad knew were legion. But then, he was an Army driver.