I am becoming disenchanted with internal lock poles. I have have had internal lock poles from major brands (Komperdell, Leki, Fizan) and they all collapse a little on the trail. Not much, maybe an inch or two, but I don't like that. It is irritating on an uphill or jumping across a stream. I don't abuse them, I tighten them properly, and I take them apart and clean them with a rag and water, but they still do it. I'm thinking of switching to Black Diamond trail poles with flip locks because I've hear they don't collapse. I tried some at REI and really put a lot of pressure on them to the point where the poles bent a little, but they did not collapse or slide down. I'm just wondering if they collapse on the trail like the other poles. Anyone have any experience with the Black Diamond flip lock poles?