[poorelise]

I think you are fooling yourself by constructing a more complex scenario that is therefore more impenetrable. The story already says that the light flashes one second before you press the button, or rather no matter how hard you try, you can't press the button sooner than one second after the flash - consequently you wouldn't be able to knock the device away. You could already say "if the light flashes, you press the button within 0.5 seconds, therefore the story can't be true". But the story says you can't do that.

So by inventing your mechanical device you haven't added any information to the puzzle, only confusion.

I think Searle's Chinese Rooms employs the same fallacious way of thinking to refute strong AI.