I have something you could try. It just worked for a Military with a stubborn tube. Granted it doesn’t have a liner, but I think this could work for a pm2. I just don’t have one with a tube that hasn’t been pulled before. Anyways, get some qtips, and start putting them through the tube. I used 4, but ymmv, if it even works.
Make sure they are lined up evenly, and pull them all back through at the same time, so they all wedge into the tube.
That will give you something to hold onto so you can start to wiggle back and forth as you start pulling.
Hopefully the qtips have wedged tight enough and push the tube through like this.
Again, I know this a different model, but what could it hurt to try? I wish I had a factory fresh tube to try this with. But let me know if you try and it does work. And if you’re skeptical I understand. But know that I once pulled a tube from a manix 2 with just some string
“My job? Boilers and toilets, toilets and boilers. Plus that one boiling toilet. Fire me if you dare.”