Making the Tube Rounder

Making the Tube Rounder

I've mentioned that the two aluminum tubes that I had fabricated came out far from round. I've been trying to stretch the upper tube assembly to get it closer to round--and I'm getting somewhere! When I started, this tube was about 20 5/8" ID on one diameter, and about 19 7/8" on the diameter perpendicular. Now, by using a clamp/stretcher device I bought at Harbor Freight, it is now 20 1/4" on the smaller diameter, and 20 1/2" on the larger diameter after removing the stretcher. I'm hoping that if I keep this up, I will get it to 20 3/8" both dimensions--and if not, this is getting close enough to round to do what I need to do.