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Back focus?? 120mm
The x0.6 focal reducer is designed to sit, from memory 120mm inside focus ie 120mm from the CCD chip.
The Canon with a T-ring adaptor is 54mm deep, so you need about 66mm.
If the focusser is longer than that, then the reducer must be placed after it and a T2 to T2 spacer (66mm)used to position the camera.
No sure about the WO focusser... is it a 2" or does it give SCT threads at the eyepiece end??
If it's 2", then an 2" ORION prime focus adaptor is a good thing to have; this gives both the option of a 2" to SCT male, and a 2" to T2 male.
Most (??) good camera shops still sell T2 spacers. Worst case, Baader do a complete range but are rather expensive in Oz.
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