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I made my spacer so the stop collar could be removed and the spacer and MPCC slide into the focuser draw tube. The MPCC is meant to have 55 mm from the surface of the CCD to the telescope side of the stop collar. The stop collar is 2.7 mm thick so the spacing to the CCD side of the stop collar (or where the M42 thread ends) would be 55-2.7=52.3mm. Through testing I found the best spacing for my 10" f5 GSO newt is 16.5mm (CCD surface to front of camera t-thread)+43mm (spacer)=59.5mm from front of CCD to telescope side of the stop collar.
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