Ross Eckler's article Word Networks on Wordlock (November 2006 Word Ways) was about a combination lock that uses five rings of letters, instead of numbers. This reminded me of a similar device which I have, a plastic toy called Satanix, but without the lock capability.
Word Ways: Vol. 40
, Article 27.
Available at: http://digitalcommons.butler.edu/wordways/vol40/iss2/27