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Thanks for the feedback guys. I appreciate JB's thoughts and "try it and see" is definitely a good approach, however i'm not opposed to cutting a hole or 3 in my tube. This scope is designed to be a high mag planetary workhorse, and if a few holes means it can do that job better, then that's what i'll do.
The 10" fan didn't vibrate because it was mounted differently, on a piece of aluminum held on with velcro over the top of the collimation bolts (with appropriate holes for the bolts to stick through). The design of this 12" with the fan attached to the mirror cell is the definite cause of the vibration, and I have contemplated mounting it how I did with the 10", but as DP said, there's active cooling coming my way soon so i've held off with mounting the fan differently for now.
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