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You should not need the extension tube, unless the Newt is built for astrophotography. (in which case you will use the extension tube when using an EP, and no extender when using a DSLR or similar) - This is due to the sensors in DSLR's being set relatively "far back" in the body
Also, are you sure it is an extension tube, and not a barlow? Are there any optics inside it?
As far as focusing, all i can suggest is to start with the focuser all the way in, and slowly change focus while looking through the EP.
One possibility is that the blur you see is actually something much closer than what you think the scope is pointing at?
james
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