Mounting BLX85 Fan

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Melbourne, Australia
Arrma RC's
  1. Raider
I have a brand new 2016 model Raider BLX XL after upgrading from my old Raider BLS.

I've got a BLX85 fan (AR390249) and I wish to mount it but I'm not entirely sure how to do it.

Is there a visual guide or a video for mounting the fan.
Also will this mean that my ESC will no longer be waterproof?

Thanks in advance.
On the blx80, the screws for the fan just thread in between two fins on the heat sink. No threaded hole or anything, the screws just get pinched between the fins. A bit cheesy, but it seems to hold fine. Anyway, maybe the 85 is the same?
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