Popular Mechanics posted an article in their magazine in December, 2004 describing how the tubular pin tumbler lock in the Kryptonite was compromised easily with a ball point pen. This attack was published on security.org in 2004 by Marc Tobias, and resulted in the recall of 350,000 bike locks by Kryptonite and Schlage Lock Company.

Read the article in Popular Mechanics. PM1204