Got pictures? I'd love to see. You were able to find replacement heatsinks that could screw in easily with the existing screws?
I'll take some pictures tomorrow. If you can post a picture of your multimeter (and I have a cheapie in my desk drawer at work, because you don't leave home without a multimeter) I can tell you how to set it up.
Regarding the heatsink, I drilled and tapped and old Xeon server heatsink because I planned to do impolite things to my first 2pac. I'll get some pics of that, too. Any heatsink can be drilled and tapped to fit the 2pac, but if you're uncomfortable tapping threads you can simply drill through and use screws and nuts.