I bent the lower section of my Leki Malakus 3 times, and they have sent me replacement sections each time. Although the last time they did suggest that I get a heavier duty pole .
Got the replacement section from Karen Kane a few weeks ago, all shipped free, within about 10 days of filling in the web form. It came complete with new carbide tip. The standard hiking, skiing, and deep snow basket attachments that I have accumulated over the years still fit this tip.
Upon disassembly of the old pole, I noticed the interior polyethylene expander had ground aluminum oxide on its surface whereever it pressed against the interior. These points were polished and much smoother than non-contact points. I never had a problem locking the poles but I could see how this is part that wears and can lose its grip. You might consider getting new expanders if you have any trouble twist locking the poles.
FYI, I was told the Summit Tour model is the strongest LEKI metal pole.