Serum, if i'am right, you've use the thread screw in the heatsink to "screw it" on the aluminium plate, right??
And i can see you have the "cube" version.

But your controler is mount in a place where the airflow seam to be very restrictive, you don't have any heat problem?

Thank you!

I've forget to put mine yesterday......ouch!!!!!!!!!!!!!!!