Interesting... I had spacers/shims on my 450D and removed them, not that I needed to because I do not use this camera for everyday photograpphy, I have another one for that (also obtained for couple of $ on ebay as faulty).
Factory focus fine adjustment is done in Autofocus unit which is on the lover part of the mirror box, and it is done individually for each camera and then fixed.
Anyway.. clear skies!
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