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Ok, I might just try the fan without the disc first. I am pretty sure I have a couple of old 80mm fans in the shed out of old computers.
BTW. The reason I had the primary out in the first place was to losen the mirror clips. I read in a astro book that the Chinese/Taiwanese tighten them too much so they are not damaged in transport. I losened mine a little, just enough to fit a business card between the glass and the clip. Put it back together and collimated it. I just looked at Saturn and it is the clearest I have ever seen it. I think my mirror was pinched before.
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