Okay - I used a lot of “might” to push on the ends of this heatsink to no avail. Literally, I was scared to break it - I could feel one side moving and the other not budging. I used a large flat-edge screwdriver vertically into the Mac Mini, prying lightly against the edge of the case hole and onto the back edge of one of the silver fan standoffs protruding from the motherboard. Very little leverage here caused the board to pop out past those tight clips. Phew!