Just received my first pair of trek poles today. They are aluminum BD Trail Backs, $40 from STP (Woohoo!) and weigh 10 oz each (D'oh!). I finally got a chance to closely examine how the flip locks work. Big pole clamps down on the little pole. Pretty simple.
I've seen quite a bit of commentary on slipping locks on a variety of brands (perhaps less so on BDs) and my first thought is, has anybody taken fine sandpaper to the part of the smaller pole that slides in under the locks? Particularly making scoring marks that circumscribe (rather than run the length of) the pole? That would seem to vastly increase the friction of aluminum-on-aluminum and make for a solid lock-up.
I don't know how twist-locks work, so I've no idea if sanding would help those or not.
I sand the portion of overlap on my windscreens, and that works almost like velcro. Well, not quite velcro, but much more grippy and easily held with a paperclip, compared to just smooth windscreen material. Thus the thought about poles.
What say?

