Rick,
When you're bending the PVC for these A-Frames, they don't make that much of a kink to really matter....
I actually have some old play sand I could fill my tubes with before bending them, but, it's not all that for a project like this.
Once the bends cool (in about a minute), they're still solid. And, the tubes only flatten wall-to-wall if you heat them to red hot before bending them. I keep the gun moving from side to side, heating the whole area as equally as possible. As soon as the tube starts bending down, I give it a tiny bit of pressure, backing off on the heat gun. My kinks aren't flattened entirely...
Hope this helps!
Linda
