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Mike,
I have 1 fitted to my scope so I can show you exactly what it is. The only difference being, mine has a slightly larger aperture than the baffle Geoff is talking about. I installed mine purely as a light baffle hence the slightly larger aperture. I previously had installed a mask exactly as Geoff described but subsequently removed it as it caused an issue with tube currents but at the time I did not have the cooling fan installed. I may have a fiddle there again and see what effect the sub aperture mask has in conjunction with the cooling fan and the boundary layer air pump, that may just all work nicely actually with 2 air sources helping to move the tube currents.
CS-John B
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