Custom (very) Quark esc heatsink...

[BrianG]

The whole thing is held by the sticky thermal pad at the bottom. When I removed mine, I took a small flat-bladed screwdriver and gently pried the heatspreader off the case. Then, even more carefully, pried the heatspreader off the FETs. Gotta be careful here as the casing on the FETs can break.

You could take it completely out of the case, attach a larger heatsink, wrap the rest of it in heatshink, and then cut a hole for the heatsink like how the BK Warriors are built. But, having a nice metal enclosure is one of the nice things about the quark as it helps to protect everything else.

Oh, and those pins connecting the two boards are soldered in. They are very close to some other surface mount devices so be careful if you decide to desolder the pins! Those nearby surface mount parts can easily be damaged by heat and there goes your $280 controller!