My bontrager line elite seatpost has some vertical play. I bought it because it's supposed to be cheap and easy to maintain, but instead it's gonna cost me $105 for a replacement cartridge. At that price I may as well buy a whole new post. Any thoughts on how to remedy it? I took it apart and relubed but it's still clunking. Seems like the cartridge has a tiny bit of play that is magnified when completely assembled. It's a wintek cartridge dropper, but it doesn't look like it uses exactly the same cartridge as anyone else.