I assume there's a hole in the steerer tube of the fork. When the lock is pushed in and locked a short pole goes from the lock through that hole thus preventing turning of the forks.
like this http://www.google.co.uk/patents/US6161403
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I assume there's a hole in the steerer tube of the fork. When the lock is pushed in and locked a short pole goes from the lock through that hole thus preventing turning of the forks.
like this http://www.google.co.uk/patents/US6161403