Trimmer on a Duplo 5000

I was wondering if anyone has had the issue we are having with our Duplo.

Our trimmer is off 1.25, meaning if we need to face trim a book at 5.5 we have to set our trim size to 4.25. I've read the manuals and unless I'm missing it there isn't a adjustment to correct the problem.

Any help would be appreciated, thanks.
 
   
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