What are you using to hold the pipe when doing a 12 butt and branch test. For the butt I usually just tack it on the end of a piece of 6 or 8" that I have on my jack stands. I have hung the branch from jack stands by running a piece of 3 or 4" through the carrier pipe. One company I tested for had an adjustable cart to weld off of and that worked really nice, I could raise it to the perfect height and spin the branch so I didn,t have to keep jumping back and forth. Thanks- Ted