Hey Peri'. Hope I'm not earning your ire over your admonition, ". . .don't need any discussion on using ammonia or other things. . ." buuuuut have you tried Herr Brown's 15 tried-and-true techniques? [Cringe] Anyway, here 'tis just in case. . .http://sheldonbrown.com/stuck-seatposts.html His article says among many other things, ". . .penetrating oil is made specifically for this purpose."

Perhaps Sheldon "Get a Bigger Hammer" Brown could weigh in here if he passes by.