Sink leak and resealing

I need to disconnect to power line from the disposal. It's attached directly to the on/off switch under the sink. How do I get the two black wires out of the switch box? The screws don't loosen them and pulling them but they won't budge.

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Also tried to push to release but no dice. Maybe didn't push hard enough but don't want to break it either.

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You gotta give it a pretty good push. It won't break. Are you removing the entire unit? Just wondering why you have to remove the switch.