Like a lot of nice people, Jon is always willing to help others out by measuring their barrels with his setup. Once you see how easy it is, or how easy he makes it look, you will seriously consider buy his tool. I have two different setups and find his give me the most consistent results. I just hope I am doing it right every time. If you are going to buy any number of doubles a good measuring device and the knowledge of how to use it is one of the best investments you can make. I have passed on more than one double which looked to be high condition only to find out the barrels were paper thin. Shine hides a lot of sins.
