Mapes still has her true believers. I have spoken with a few of them. I have tried to explain the overwhelming evidence against the authenticity of memos, including the typographic evidence, but they continue to believe that "some typewriters had that sort of spacing back then, so the memos might be real."
Part of the difficulty in changing such peoples' minds comes from the difficulty of explaining the evidence against authenticity. Take the case of the animation showing two nearly identical versions of a TANG memo, the original and a version created in Microsoft Word. The Mapes believers say, "Sure the images look alike, so what? They both have the same words, so of course they look alike." It is hard to explain why they are wrong without being sidetracked explaining terms like microspacing, kerning, fonts, and typefaces.
Yet there is a good analogy available in something that everyone understands: keys. The precise shape of a string of printed characters is as unique as the shape of the teeth in a key.
Even a small change in a key's shape prevents it from fitting its lock, just as a small change in the shape of the printed characters would have produced document images that did not precisely match. Yet, after accounting for some apparently fax-induced artifacts, the document images do precisely match. There are many thousands of points of identity. Anyone with a copy of Word can easily produce his own "forgery" that is nearly identical to the CBS "original".
If two keys open the same high-quality deadbolt lock, the keys can be presumed to be copies. The same can be said for two matching document images.
One of the main problems with the memos in the superscripted "th".
All of the high dollar typewriters of that age simply raised the ball to superscript. Thus the top of the "th" would raise above the nubmer it notated. The word program reduces the size of the "th" as well as raising it.