Not 100% sure of a solution but I did find this.[br]
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https://youtu.be/KIVxmYTM-dU
Hope it works. [br]
no matter what. do not put wd40 or any similar crap, i know he mentions it in the video. but I’ve worked on locks where people have. WD40 and similar products have particles inside the spray which eventually will settle in the lock causing internal pins to bind and in the end the only way to fix it is replace the key cylinder.