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MPCC coma corrector - getting 55mm back focus


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I have a MPCC Mark III coma corrector (Baader) and a 294MC colour cooled.  I am trying to get a 55mm back focus. 

I don't know where 0mm on the coma corrector is relative to the focal plane.  By 0mm, I am referring to 0mm in the second photo with a camera where 55mm back focus is achieved with two extenders. 

If I ensure that there is 55mm to the camera in the first photo, is that correct? 

 In other words, do I just use the two extenders and connect the coma corrector, having removed the thin ring that comes with the coma corrector (see red arrow in first photo)?





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