Well, to take a trick from flyfishing, use two or three people. Have each get a grip on each side and pull to free it (after loosening it, of course.) A few *gentile* taps will free up most corrosion. Then just try again. 99% of the time, this will free up the pole. It works on all sorts of poles and is a simple application of “more power.” I have pulled ferrules off that were frozen, though…necessitating repairs. This won’t happen with a hiking staff. I have had some older cheap ones from Dicks do that. I still have one in service as an emergency staff (for when my mind is lost and I cannot remember to bring mine…hey, hey…) If the prob;lem is a twist, have all hands twist properly, as is the case with the cheap Dicks poles. (Yes, they were corroded together.) With three people you can actually twist the aluminum, so be a bit careful. No, oil won’t work on corrosion. However, a couple nights of hot water will free up the mineral salts. Then use a hard wax (car wax) to keep it from corroding.