I decided to give my 3 section pole a bit of a service since it would not grip properly anymore and would require it being tightened up so much that at times I could not undo it again!
When I took it apart, the locking cones did not seem to be worn out.
I gave the whole pole a good clean useing T-Cut.
I reckon that as the aluminuum wears, it becomes like talcum powder an acts like a lubricant.
Next I cleaned the locking cones.
Then I oiled the THREADS ONLY on the cones. Don't get any on the pole or the bits that actually clamp.
Iv'e been using the pole everyday for over a week and it now performs like new again.
I was astonished at the difference a little TLC can make!
 

If I remember rightly, it's CLEANTECH'S own brand with a metal angle on the end.
Iv'e used UNGER poles and had exactly the same problems. I expect that most poles using the locking cone system would respond in the same way
It's worth a try but remember, the cones could be worn out. Mine wern't but would still not grip proerly till I did the maintenance.