Hi Phil, This echos my experience. Although I had close to 20 years prior machining experience by the time I built my prototype regulator, there were a few perfectly good shop methods that I had to UN-learn because they would not give me the precision I was trying to achieve. Just a suggestion regarding taking notes. Would you consider posting all the lessons you learn, even the ones you now have to back up through? This might be of help to all of us here who appreciate the depth with which you are going into your project. After all, there really aren't that many of us who value the degree to which you are studying your efforts. This thread of yours could become your notepad and our reference. I don't know just what your background is but I think you would make a great researcher! Thanks so much for your time and dedication. I am exactly the same way! One of my favorite prayers is," God grant me patience, but give it to me now". Someday if it ever happens I'll let you know how it works out!