The southord jigglers are actually very very hard on locks. I would never use them during an auto lockout as even used properly they cause alot of wafer wear. When used improperly they can actually damage a wafer bad enough that a key will not work. This damage can be done by bending wafers or wearing the wafers down badly where they interface with the key causing the key to no longer lift the wafer high enough to pull it all the way into the lock core.
If you are going to use "jigglers" either buy the proper kits designed for ford, gm, chrysler, etc. Or if you want a key type tool use a properly designed and cut Marshall key set. You can also buy tryouts but these have a ton of keys in the sets and are expensive to buy. In the end even if you find a key that works with the tryouts you cannot just copy it as they usually don't work well in the lock because they are based on the half cut theory. You end up with a key that is close and must be worked on and impressioned to end up with a key with the true full cut bitting.
Hope this helps some. I can offer help on the proper tools to use but in the open forums I cannot explain how to use them or offer input about tips or tricks as this really gets into being a topic for the automotive section of the advanced forums.
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