Originally Posted by
Fastfingaz
Thompson elite is aluminum,, but I don't get the concept of the shim, I'm sorry limited brain cells,,, someone also suggested cutting seat post and hammering down into frame at least six inches?
My frame was made for a 28.0 seatpost which is a rather uncommon size. So, someone installed and shimmed a 27.2 post which apparently got stuck and broken.
Carbon + Aluminum is a bad mix, at least for seatposts.
Here is a discussion about Lye, Ammonia, and various solvents.
Corroded Seatpost Removal
I think the OP went with PB Blaster, but never reported back whether the frame was destroyed, or they got the post out.
Keep in mind that at least a little grease gets on CF without any damaging consequences.