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I'm guessing that the 123 used a mechanism similar to the 201, with which I'm more familiar.
On the 201, there are two holes and you have to insert a U shaped wire which is beveled to a point on both legs. The wire compresses the spring that holds the cylinder in place, but in addition the tips move the levers that hold the anti-theft collar. If yours is similar, then the trick is that you need the right bevel on the wire, and you have to press it forcefully in past the lock cylinder spring. See the photos of my 201 that I've attached.
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