Originally Posted by
oddjob2
Stick it in a bucket of lye or drain cleaner and let it eat up the aluminum.
+1
I have soaked forks with stuck stems in them in Oxalic Acid & also in Evapo Rust with the same results, after about two weeks the stems came right out. Evapo Rust is safe for aluminum so it doesn't eat at it like Lye or OA, but still worked just as good.
Glenn