The AMI equipment training you provided to us these past 2 days was very informative and educational.  John, you are a very talented teacher - articulate, knowledgeable, and thorough.  You gave us a great understanding of how to perform fusion orbital welding.  I now know how the power supply and cooling systems work, and how the weld heads perform.   The other thing that was the most valuable were the troubleshooting techniques, and 'rules of thumb' for maintaining the machines....