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Rohm Supra Drill Chuck needs a new arbor

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I bought the Jacob's arbor removal tools, 3 different sizes.
Either too big or too small.
If you aren't familiar with a Rohm, made in Germany, keyless drill chuck, they are very close to an Albrecht.
I have seen videos where they drilled and pinned the old arbor to make a stop for a pipe to allow the wedges to work.
I got this pic online. Mine is in better shape, same idea though.
Any other ideas? Rohm Supra.jpg


Bring it to the meeting tomorrow. There will be plenty of hands on advice there...
I had a drill chuck arbor stuck . So I cut if off and drilled and tapped a hole thru it .
Then I used a bolt thru it and it popped right off.
You pushed it off by forcing the bolt into the chuck?
I cut the arbor off close to the chuck . Then with a thread all the way thru the piece of arbor that was left I used a bolt thru piece and bottomed out where it hit the back side of chuck . And tightened bolt till it pushed the piece of arbor out.
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