Pool noodle crafting

[MythicFables]

So I've seen lots of guides suggesting I use pool noodles instead of pipe insulation in my boffers, but none of them have really answered a basic question I have... How do you secure the noodle to your core?

The couple youtube videos I've seen just have them sliding the noodle on the core and then securing it with a ring of tape at the bottom... and that's it. I don't know if that seems super durable or safe to me. What happens if the ring of tape keeping the noodle on breaks? When I use pipe insulation I use carpet tape up the length of the rod to make sure the foam is secure and will stay in place, but with pool noodles I don't see how you'd be able to slide the noodle on if there's tape present. 

Anywho, I'm still a noobie at boff crafting who doesn't know any better, so I thought I would ask the more experienced crafters how this material works? I'm working on a silver dagger right now and wasn't sure if I should use the noodle I have laying around.