Broken key extraction can be a very stressful experience at times, especially on most foreign makes and models. The following method I am about to describe, I've learned from a fellow locksmith technician who had more experience with broken key extraction than I had. The first time I tried using this process was on a customer vehicle's door lock who just wanted the broken piece out so he can use his spare key to open the door. Ever since, I had only success using that same method in order to extract broken keys from foreign vehicles.
The only things a locksmith technician needs in order to execute this method is a power drill, spiral extractor, and steady hands. At a point where it is determined that the standard key extraction method will not work, use a 3/64 bit with the power drill and drill a small hole in the larger part of the broken key piece that is stuck inside the lock. Next, the spiral extractor will need to be used on the hole drilled. The extractor will be used the same way as you would usually use it with the exception of using of using pulling pressure instead of turning pressure in order to remove the broken key piece.
It could be a situation where the wafers or pins will prevent from removing the broken key piece out of the key-way. In such case, you could use a curved pick in order to lift each wafer or pin out of the way.
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