Do you regularly flush your poles out Sean? If not, then the dirt picked up from the pole hose dragging on the ground (grit & sand) will build up and cause it to jam up. If it's not that, then maybe the end stop tape is coming loose and causing the problem
Is this the best thing to do?
Can you use ptfe spray with clx or is just for full carbon like slx etc??
Both of these things can be done for the CLX as well as the SLX. Below is a recommended care guide for all telescopic poles regardless of make:
1. After each use wipe down the pole hose whilst coiling it away (the majority of grit that gets inside the pole comes from the pole hose).
2. At the end of each week open up all sections about halfway and direct a hose-jet of water up from the bottom of the pole with the pole laid nearly flat on the floor. Allow all dirt to be flushed out from between the sections.
3. Do the above at any time when the pole starts to sound scratchy in use (I simply disconnect the pole hose from one end of the flow valve and use this water to flush through).
4. About every two months remove the pole hose from the pole and fully dismantle the pole to allow a full clean between each section -
http://youtu.be/VeXQaNUb8-45. When clean fully dry each section, replace any of the joint-stop overlap tape if needed and the lightly spray the sections with PTFE dry-spray, paying particular attention to the overlap area.
6. Re-assemble the pole and re-hose.
7. If at anytime during use the joint-stop should wear off replace immediately to prevent over-extension of sections.
8. If the end cap wear out replaces as soon as possible to prevent damage to the base of the section.
9. Keep the clamp levers correctly adjusted to ensure they grip, but are not overly tight.
10. About once a month put a very small drop of lubricating oil on the lever arm cam-bed