![]() Bolt End Pressureīolt end pressure happens when the carriage is forced against the lock bolt. Wheel slippage is generally occurs on the wheel closest to the drive cam, and is overcome by adding to the last number in the combination by increments of one and oscillating the dial between the contact points each time this is done. Though less common, wheel slippage can also be caused by frozen flies and by setting the third number in the forbidden zone. Improper usage of a lock like heavy handed twisting when retracting the lock bolt, severe dial spinning when dialling in a combination, and forcing the lock bolt to extend before the bolt-work is fully thrown, can all lead to wheel slippage. And if it has been shifted to the right by two numbers, you will have to dial in the combination 18-38-58 to open it. If, for instance, the dial ring has shifted to the left by two numbers and the combination is 20-40-60, you will now have to dial in the combination 22-42-62 to open the safe. ![]() ![]() If this index mark shifts – by even the smallest amount – from its 12-o’clock position, the combination will not open the safe. ![]() When dialling in a combination the opening index is used. If the opening index is used for any of the three (or four) numbers during a combination change the new combination will be off by the number span between the index marks, and therefore will not open the safe when dialled in. One at the 12-o’clock position called the “opening index” and one at the 11-o’clock position called the “change index”. In most cases, but not all, the opening and repairing of your safe will require hiring a certified safe technician or reputable locksmith with safe-work experience. Below I discuss, in no particular order, the ten most common reasons for safe lockouts when the lock being used is a mechanical one, and different opening strategies for each. ![]() Depending on the make, model, and type of lock used, there are a number of different reasons for why your safe won’t open. ![]()
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