Pinball Headphones Information

I was interested in how to add headphones to a Pinball game since when I have many games turned on I found that I couldn't really hear the music or what was being said.  I posted a question on rec.games.pinball and found that Rick Force had written an article on how to do this in one of the 90's Pinhead magazines and he was nice enough to give me a copy of his article.  You can reach Rick at flashbk13@hotmail.com if you would like to follow up with questions regarding his design or any questions you may have.  You should note that this is for pre-1984 games and as I get a stereo version for newer games, I'll be sure and add instructions for the stereo headphone setup as well.  Thanks to Rick for the information below.

Pre-1984 Pinball Headphone Instructions