Great question — answering as the UphillTech team:
I'm guessing these are screw fit poles. This has happened to me. The problem is that the mechanism that prevents the poles from collapsing when you tighten them is essentially a friction expending wedge type mechanism. So as you tighten the bolt inside the body the plastic "wedge" expeands. I'm using the term "wedge" here, for want of a better term. What I mean is the expanding body mechanism that is inside the pole when they're together. It should be on the end of the bottom pole and will typically be made of plastic with some kind of screw going into the end. i.e. The white section on the end of the pole in this photo, above the spring What's likely happened with yours is that somehow the...
Full answer by user2766: https://outdoors.stackexchange.com/a/13782 (CC BY-SA 3.0).
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