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Leon - I think it might be the other way. Newtonians often run out of inwards travel on their focusers. From the original post, it sounds like the focuser is being wound in towards the tube, but just doesn't quite get to focus.
There are a few fixes for this - it is a well known problem with newtonians. The first is to buy a low profile focuser so that the camera sits closer to the telescope tube. Another one is to get some longer collimation bolts to move the mirror (and hence the focal plane) towards the camera. And still another fix is to cut the tube and reattach the mirror cell to acheive the same thing.
Have a search on IIS, and you will find lots of ideas from people who have had the same problem.
Cheers
Adam
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