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I'm not sure that you will be able to get the letter exactly centered in a non-fixed-layout book or using a monospace/fixed font (as Hitch mentioned). The best that you can hope for is to have the letter start in the same place...eg. the letter always starts at exactly 50% of the screen.
Honestly...unless someone is holding the original print version up next to the electronic, they are probably not going to see any difference. If you are really worried about the crosshairs not lining up exactly in the center of the letter...then don't display crosshairs!! lol
The customer will never see the difference - or care if they do see it. It's all about managing expectations.
Good luck!
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