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The 66 to 86mm is the lens to chip distance.
That is, from the lens within the flattener to your camera's sensor chip.
The flattener is designed to work around 76mm but some people like to adjust it for best results. (I've heard some people getting good results around 73.5mm, but this will vary slighly depending on equipment used.)
You need to move the flattener further out from the cam, so I posted the drawing for you to see if you would still have enough adjustment within the flattener.
If your camera has a sensor to flange distance of 46.5mm (it does), and the T-Ring is 8mm(I'm guessing) and the flattener has a flange to lens adjustment range(according to the drawing) of 14.1 to 34.8mm then the lens to sensor range of the combination is 68.6mm to 89.3mm, and the ~76mm sweet spot for the flattener is reachable.
If you then whack a 6mm spacer(as suggested by Steve) then you have an adjustment range from 74.6mm to 95.3mm lens-chip distance, getting pretty close to the flatteners sweet spot, you have a bee's-thingy adjustment one way, and a ton the other.
If you used an 8 or 10mm spacer, the flattener probably would not work for you, not at its best anyway.
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