How do I get a replacement PTFE tube to fit inside my nozzle? I have been getting clogs and believe that it may be due to a damaged PTFE tube inside my hot end.  I have a replacement (it came with my printer), but I can't seem to fit the tube into the nozzle.

I also tried to turn the original PTFE tube around, and I can't get the other end to fit into the nozzle either.

Is there a trick to it?
In the end, I was able to get the tube in the nozzle.

It took a lot of patience, and it seems to help if the nozzle is warm as well.