Oklahoma Locksmith Practice Exam 2025 – Comprehensive All-in-One Guide to Exam Success!

Using a shim is most effective in situations involving a plunger-type lock. Plunger locks operate with a spring-loaded mechanism that can be disengaged with the right pressure being applied to the pins or plungers within the lock. A shim is a thin piece of material that can be inserted into the lock to push aside the plungers, allowing the lock to be opened without the key.

In this context, shimming is especially useful for plunger locks, because they often do not have conventional pin tumbler mechanisms where traditional lock picking techniques can be applied. By using a shim, a locksmith can bypass the need for a key and achieve access without damaging the lock or door. This method is typically quick and preserves the integrity of the lock, making it a preferred approach when dealing with this type of locking mechanism.

In other scenarios such as losing a key, dealing with a jammed lock, or when the lock will not turn, different tools or techniques are required that may involve more invasive methods or locksmithing skills that do not specifically utilize a shim.