How to install fan on be quiet! Pure Rock CPU Cooler?

Solution
You generally pull it over the side of the cooler.
Refer to the manual, gives some handy diagrams on how to assemble it.
If that doesn't help you, either go to the product page and download the manual from there, or contact support.
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http://www.bequiet.com/volumes/PDM/_products/bk009/bk009_mn_en.pdf