Stu,
If your DOB is an 8" Skywatcher then you can unscrew the 1.25" eyepiece holder apart. You'll see a thread that will fit into the T adapter. This gave me plenty of infocus. However I should repeat this is only on the 8" Skywatcher DOB as I have one which I've mounted on to a HEQ5 Pro mount. I also have an Orion ST80 with a QHY5 camera attached (as a guide scope combo) to the 8" and the HEQ5 Pro handles it all with no dramas.
Cheers,
Mario
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