Interesting. Questions, for different reason: Is the top telescoping section round (no flat or slot to keep aligned), does it come completely out, or has a stop at top of travel, and what is the diameter of the top section? I ask because I wonder if any of the suspension seatposts would fit that; Thudbuster used to make a long 33.9 post for Dahons and the like, but no longer. But they still make shorter and smaller diameter posts. Thanks in advance.