You make shit too complicated. What the fuck do you need PVC pipe for? It's not a pipe bomb...
The hardest part should be deciding whether or not to wear rubber gloves so you don't get messy.
Firmly press each side together. Once you start streaking with it, it's gonna' mesh even harder at the tip.
Sbal, the only party you messed up on was your cutting utensil. The floss part is nice cause it slides through like butter but the plastic behind it is the problem.