Help fixing a power switch
Just make sure the device is unplugged while working on it. The switch just serves to pass the hot phase to the device. You probably bent an internal contact in the switch, or deformed some plastic component that holds the switch latched. If you don't mind loosing the on-off switch, I'd just solder together the switch input-output, meaning once plugged in the machines is always on, you'd have to unplug it to turn off. Otherwise you can just replace the switch with any other 2A mains rated switch, might not look original but maintains functionality. The blue capacitor across the contacts really only serves to stop ripple from the mains, and is not indispensable, so if you replaced the switch it wouldn't be mandatory to transfer the capacitor.