The most common cause for this happening, is the retainer cap has come loose. On these types of ignitions, there are tumblers in the cylinder. On top of these tumblers are springs.
Holding all in place is a metal retainer cap which is staked in place. When the stakes are wrongly placed, not deep enough, etc. , the cap will come loose. When you insert your proper key, it allows the cylinder to turn to a spot in the housing that is larger than the cylinder.
Once at this spot, the cap pushes away from the cylinder and locks it into place. Once this happens, it is best to call a reputable, licensed locksmith to replace the ignition cylinder.
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