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See message in the beginner equipment section regarding 31mm Nagler and focus. The OP didn't mention Paracorr but I thought I'd try both to see what effects there are on focuser travel. Then I found your post.
I think the tuneable top was, (maybe still is) available for the Paracorr you have so the base may be the same design. I'm not sure the effects on a camera but for visual with a 31mm Nagler and Paracorr tuneable top set to position 5, the extra in focus travel is approx. 6 - 7mm with Paracorr in place.
The note on the Tele Vue web site stating that the 1.15x magnifying factor was introduced to push out focus but this should not be taken as to push out past the position with no Paracorr but rather push out from a reference position of a Paracorr with no magnifying factor. This is to better allow usage of the Paracorr with most telescopes without modification. The 1.15x factor also flattens the field a little.
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