I find that my two CL-X poles expand and contract noticeably with the changes in temperature. If the temp is cold one day, the clamps need to be tightened slightly. If the next days temp is noticeably warmer I have to slacken them off again. I've even had this happen during the coarse of a day as the temp has increased. I've also noticed with my older pole (1.5 years) that the clamps have become much easier to operate. However, I still love using it. Even after 1.5 yrs of use it's still much better that the poles I had prior to it even when they were new.