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Better you don't pull anything off yet. The picture I posted was a general view of a fan on a scope. Let's hear from someone who knows your scope. If the mirror cell is already drilled and threaded to take a fan, it will be a standard size. The electronics shops will sell a suitable 12 volt fan for not too many dollars. Then you need power to it - either from 240V mains through a plugpack power supply, or connected to a 12V battery or 8 x 1.5V batteries in series.
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