Yeah thats what I was thinkin' . Get two buckets. 1 with 2 3/8" tubes, 1 with 1 1/2 tube and see what happens. The .065" wall of AL tubing is fact. So a 3/8 has a ID of .245 and the 1/2" ID of .370. I just could not get it out of my head that 2 3/8" tube shoul... Login to read more.