I am only just learning of this magical switch now. Whats funny is, I got my machine 2 month ago and looked at that spot and thought to myself "that seems weird, is something missing?" However I never looked into it until today.
If someone has the plans for how they built it and would be willing to share I sure would appreciate that. I'm game to take on the challenge. Never built a part before so why not. I just want to make sure it emulates as close to the real experience as possible.
Also, I've been looking for the story on why this switch was left out in production when it seems they completed every other aspect of this feature. Does anyone really know why? I guess why question it? It's cool you can just plug a thingie in and get more from thew game.