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Get the rust off you mean?
The industrial powdercoat company I have used before should have a bead blasting cabinet big enough for this, but the above mentioned cross frame is currently being painted at a friend's wife's dad's company. They specialise in painting trucks/lorries so I am not expecting much, but I am hoping it is better than the powder coaters because they do not give a shit. They are cheap but handle everything rough.
Cargo bike BB shell sorted