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The shaft of the adjusting screw on my car is 20 mm and it easily reached the button. I don't think there is anything special about screw although it does have a conical end that presses on the button. You can probably replace it with a longer screw of the same pitch and diameter.
It turns out that, in my case, adjusting the screw had no effect on the prolonged revs. (I suspect that the clutch may be sticking)
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Steve B.
1972 911t
1999 328is
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