+1 for the hole saw idea. As soon as you can knock the cartridge out you should be on easy street. My only concern is that aluminium oxide (alu+steel+water) could be the reason the cups are not moving, in which case they may put up a fight.
@LeChef started
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+1 for the hole saw idea. As soon as you can knock the cartridge out you should be on easy street. My only concern is that aluminium oxide (alu+steel+water) could be the reason the cups are not moving, in which case they may put up a fight.