Hi Mike,
I believe the plug is to alleviate vibrations that can occur in the steering.
You can make your own plug using any semi-hard plastic (nylon is the
original material) that doesn't become brittle in the cold. Possibly the end
of a Bic pen, or use a hollow punch on an old thick plastic bucket, etc., or
go to the hardware store and look around-how about the nylon on the bottom of
furniture coasters? All my Mk1 racks came without the hole. I think it came
about on the Mk2's.
Bill Brockschmidt
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