This what my brothers egineering corp,was involved in before he passed away.He had told me about it,,but the video really explains it,,thanks for posting that,,when he tryed to explain it to me,,I just couldn't get a picture in my head of how it was done.I've always liked videos of how things are made,,or accomplished.He was making weekly trips to several locations throughout the world,,to help with the drilling setup.When friends of the family,used to ask,,"well,,what do you and your brother do now?,,my answer always was,,,well,,we're both in oil,,he gets it out of the ground,,AND,,,I play in it",,Unfortunately,,his company was also involved with "deep well drilling",in the gulf,,,and we've seen the end results of that,,I'm kind of glad he wasn't around for the traggic end to that.Thanks again