Thanks for your explanation, Mr. Dudley. I have explained this method a dozen times and readers insist on ignoring it, even though it comes directly from Jon Hosford. At least two of us can get some use out of the Manson gauge. It is amazing that Pooch can read this entire thread and still insist that he can't figure out how to use the gauge horizontally. Of course, I have only explained it a few times in this thread.