The common misconception is that these keys can open any lock. A Master Key is defined by the specific pinning done on a lock cylinder, if a master key combination is not coded into a lock, it will not operate the cylinder.
Master Key Combinations Should:
1. Contain one of the deepest possible pinning cut.
2. Contain one of the shallowest possible pinning cut.
3. The cuts should not look like a straight line.
4. The shallowest cut should not be at the tip of the key.
5. The deepest cut should not be at the tip of the key.
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