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Acetone is suggested by more than one source, so I'm hopeful...
You won't be after you've tried it. The whole point of epoxy adhesives is that they are highly resistant to aliphatic and aromatic alkanes, alkenes, alcohols, aldehydes and ketones. You need a chlorinated solvent, and dichloromethane seems to be the most favoured for softening cured epoxies.
Unlikely that acetone will touch it as it is a chemical reaction which made the glue set. Are the bars plugged in the same way at each end? I think boiling water might have some effect so stick them in a saucepan and see if the ends will loosen up. If you could get it inside the tube it might work better if it works at all.