I’ve always battled a bit to keep my Propel seatpost creak free. I’ve only had the bike a few months, but it’s been cleaned and new carbon paste reapplied every almost every ride.
Today I took the post out and peeped inside to make sure there were no cracks. It seems ok but the finish in there is rubbish! One side is totally fine, the other side is covered in gouges. That bit of carbon you can see at the front, there’s a sharp edge to it, so I’m guessing it’s not supported all the way around. It doesn’t even look like the carbon was laid flat when resin was applied.
https://photos.app.goo.gl/pkz6eo3GSBeyrZaG2
https://photos.app.goo.gl/5TOOyWjj24karWyV2