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Describes the lock's history as a UK government standard, its acquisition, and the four-number dialing sequence.
Details the rear of the lock, the bolt's movement, UK government markings, and how the rear case is secured.
Step-by-step guide for setting a new combination using a key inserted through the rear cover.
Lists forbidden combinations like consecutive numbers, all tens/fives, and specific number ranges based on bolt position.
Explains the cylindrical disk pack and how the combination numbers are hidden and accessed.
Describes how the notches align to allow the comb to fall, enabling the bolt to be opened or closed.
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General