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fizzy.bleach
Scilly.Suffolk
Did you manage to get the cartridge BB out after destroying the plastic cup?
If so, you could now thread a hacksaw blade through the BB shell, attach to the hacksaw and saw a few notches into the remaining metal cup (being careful not to damage the BB shell thread) so it'll hopefully fold in on itself with a bit of force. I think I read that @sumo had done this and provided pictures?...