Kutter, I understand that most work can be done without removing the extension. I am not interested in refinishing. However, I would like to remove the barrel from the extension and install another barrel on the same extension. These instructions and tools and fixtures are way more than most of us can take. Another question, can we expect to install "another" barrel on an extension and have it index at the same place. If it doesn't tighten up at the same index mark, what is the solution?