same setup...
in a SM750 case it was tight trying to put it on an installed mobo, so do it on the mobo outside the case.
Also, <DISCLAIMER>im a moron</DISCLAIMER>, you'll note grooves along 2 edges of the HS contact plate. make sure one of these grooves is overlapping the edge of the ZIF socket closest to the edge. doesnt make sense as i write it, but look and you'll see. i didnt do that, got the HS resting on the ZIF socket, and wasnt making good contact with the core. no damage, noticed before i powered up, and fixed it.
k.