I recently bought a leki pole from the charity shop. It was a bit stuck and wouldn't lengthen. But I bought it anyway as I figured some wd40 and a pair of pliers would solve the problem. It did... in a way. The bottom bit came unstuck and lengthened out but you could not tighten it again to stop it collapsing when you put it to the ground. Well a bit of research shows how to maintain a pole with this sort of screw which tightens up into an expander which stops the collapse. I seem to have no expander. I can't tell if it's totally wedged in the pole interior or missing. Any expert leki pole users out there with a tip to help me find out which problem I'm facing? Thanks