James, your comment is obviously very good advice. However, when you get to be as old as I am, and your memory continues to fade, you tend to forget those pearls of wisdom. Thankfully, I found a backup solution, but I don't really like to have to use it. I only utilize this method if the turns are irreplaceable. Many more times, I have decided to split and part off the blanks, salvaging the tubes so I can start over.