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@bonbiker
I also have a stuck seat post and am just about to embark on the ammonia route, how did you administer the stuff and how long did you leave it to work on the oxide, also where can you get the ammonia in the first place. (I have a lot of faith in Sheldon Brown's advice and he appears to have liked this method) Also how did you use the Coke method since this sounds attactive but not as potent as the ammonia
Regards
Br