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The Dirty Duo. The Duo lock is somewhat unknown among lock enthusiasts, often looked at as a simple wafer lock. The Duo, however, is not everything it seems, as it features a non-reversible key and generally found in 8 or 14 tumbler versions. The higher end Duos’ feature more than the standard double bitting (cuts on the top and bottom of the key) and are triple bitted (having two parallel tracks on the top of the key, and one on the bottom). In addition, the Duo uses one spring placed between every two wafers (one pushes up while the other down, countering each other and making it harder to manipulate) unlike standard wafer locks. On the tripple bitted keys the lock does not use split wafers like some wafer locks, but rather one of the tracks is actually a side track (set slightly lower than the actual top track).  I decided not only to make a cutaway of this lock but to do some restoration work for cosmetic and functional purposes. So let’s continue…

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