I found the thread again. The rigging primer is in the comments theres a zip file and a pdf. I'll post a link here so people can circle back to that thread.
Some forums get uppity about re discussing things and insist you go back to the old conversation which they then leave up to you to find. I think that's annoying and unhelpful. I've also found we get new information every time we discuss something so if any one wants to add to the conversation they can use this thread or another thread. Linking threads and having several discussions I think helps up the chances of people finding what they need anyway.