Caulk tube nozzle.
Came across this yesterday whilst looking for a pole extensions. The idea was to use it as an insert inside the extensions to reduce pole tip wobble .
I will play with that today but if someone is looking for an easy and cheap way to protect gear from those carbide tips during transport, this could be it.
Note that I have not trimmed this down to size as yet..
This has been probably suggested before, but just in case...