Try drawing a very slight, erasable pencil line down the center of the page. Then, using the the paper release lever, manually shift the paper to line up with the type guide.
Perfect? No. But as close to perfect as you can measure on a .pdf file posted on the Internet.
your post appears to evidence that you've never worked very much in the way of reading comprehension.
Please keep in mind, I'm on your side in this.
As I said, you're free to give it a try and post your results here. But I'm also warning you right now to save you the time that it simply isn't gonna work. If you're good you might be able to come kinda sorta close to getting something that is centered in its own right but it won't match up to what a word processor produces or anything even close.
But as close to perfect as you can measure on a .pdf file posted on the Internet.
Not really. Those pdf's were posted in very high resolution - high enough to pass as first generation photocopies of the ones in CBS' possession. They are more than sufficient enough to demonstrate that the centering was electronic. Again, if you doubt me go ahead and try your typewriter experiment and post the results.
You're kidding, right? This is a personal memo, never intended to see the light of day, supposedly, and you're proposing that the author drew a light pencil line down the center to center the address?