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@lae
I've never encountered one quite so stuck, but it's too late to be hammering bits of metal, so I'd give both the cups a good squirt of penetrating oil (or WD40 if that's all you've got) and come back to them in the morning.
Heating/cooling isn't likely to do very much since the frame and the cup will be expanding/contracting at the same rate. Only works if you can heat/cool one and not the other, and since they are mechanically connected this is difficult - you'd have to change temperature of one component really quickly before the other 'catches up'.