In reply to steveej:
Ok, so in case this helps anyone.
Leki customer service just says to return the poles to the retailer! Very difficult given theyre built up and the charge for posting a fully up pole is silly money.
I have found out that by twisting the pole section closest to the the tip that it shortens or reduces the cable (depending on which way you turn it).
The section then closest to the handle can be twisted to get it to unlock / lock.
It's a bit of a faff, but seems to work just about.
Hope this helps someone.