Neill Currie wrote:
"I have had great luck on an impossibly stuck post thus:
Remove BB, turn upside down and empty a can of regular Coke into the seat tube. Marinate for a day. The post slid out, but had a very funky, etched look to it !!"
It makes sense that the coke would etch the aluminum post, allowing its removal. In my former life as a chemist, I once measured the pH of coke, which was an astoundingly low 3.2. For reference, pure water is pH 7, and sulfuric acid is around pH 1. Every integer of decreasing pH represents an order of magnitude increase in acidity, so that coke is an approximately 100,000 times stronger acid than water (which, believe it or not, is a very weak acid).
Len Grossman
South Orange, NJ