Dr. Drew, thank you for posting my old post about how to use the Manson gauge in a horizontal position, either at a gun show or in your kitchen. If you read carefully, everything you need to know is in my post. Remember, it was taught to me by Jon Hosford, I didn't invent it. I was a machinist in training in my youth, but nowhere near as talented as Jon Hosford. It is about as simple a method for the use of the Manson gauge as you can find anywhere.