How to crack the chubb Manifoil MK IV

In this video i demonstrate how to crack the chubb Manifoil MK IV.
This lock was used by the british MoD from around 1960 to 2008 as far as i can tell, but now it is fairly easy to get on ebay and is now somewhat common on private safes. The mechanism is pretty clever, however it can be cracked fairly easily if you know how to. If you happen to have one of these locks i strongly recommend trying to manipulate it, as it is great fun.