I obviously did try to resolve it privately. It's at the point where he's ignoring my phone calls, text messages and PMs. I know that he's receiving them because I see that he is active here. This is somebody with about 300 posts (give or take 100) so he's not a major contributor but does randomly post his 2 cents.
I'm thinking that if I create a new thread and say over the story without revealing who it is rather asking/seeking advice IF I should reveal the name or not, the guy will get scared and pay up. You guys don't think this is a good idea?