Yes it seems this subject has been flogged to death. I need to do mine and have never done one before. I looked on both the Moomba and Supra forums, but stumbled on this "diamond", using google. It's great pictures of what's involved and a pretty detailed explanation on how to do it. So I though I would share. I haven't run across this in any of the forums.

http://www.pbase.com/mainecruising/stuffing_box&page=1

Hope someone else finds it helpful too.

Thanks to DOCDRS for his help to this point. He had a bunch of good stuff on the forums about this.