My friend came over with the new parts for his computer. I built my first and only computer about a year ago. It's the 2.4c based one in my sig. By my recommendation he has an NF7-S with a 2500+ barton. The most difficult part for building mine was attaching the heatsink, I used a 3rd party (zalman) unit. We're just using the stock retail heatsink on his but we are having major troubles attaching the retention clip. I've searched for guides and seen detailed pictures and commentary on it but we still can't get it. Can anyone give some pointers?