I was surfing the web this morning, looking at Backpacking items, blogs and articles. I ran across this and said, WOW! I needed this video. I use internal locking trekking poles and have been worried that when they stop working, what will I do. I much prefer internal locking poles, but so many of my friends say that once they start slipping, there is nothing you can do, but purchase new poles. Wrong, I now know how to fix and maintain them if they start to slip. I have years of backpacking on my REI poles and look forward to more.