Having seen WAY too many of these on Ebay, I have decided to offer some WAY over engineered thunder mugs. I am using 3.5" stock, 1" bore and the minimum OD is 3.25". In my blurb I was thinking of mentioning that some of the "Signaling Cannon" offered are nothing but pipe bombs waiting to happen, but I think my blurb will be "My over engineering is your safety" It will be on a base 5.5"x7.5" base that I plug weld on with 5 3/8" plug welds.