Trading out folding bike seat post I currently have an older Dahon Mariner with a Telescope seat post. The third wheel that functions as the "third leg" (when the bike is folded) has broken off. To compensate, could I switch out the telescope seat post with a longer seat post. When the seat is dropped for folding, my intention is that the length of this seat post will resume the function of this third leg. 

Is this possible?

My model does have a hole in the frame's bottom, allowing a long seat post to pass through (and function as a stand). 

Update: Thank you for all the comments below. I am still looking to do this and now have the measurements of the current Telescope seat post. They are 34.2mm and 28.x respectively. The bike does have a small plastic shim between the frame and the bottom telescope seat post pole. 



Update:
It was able to do it.
Yes

Of course it's possible, you just need to find a telescopic seat post on the market that is longer than the one you have. 

Your measurement of your post might be a bit off though, I'm guessing that from your 28.x measurement, and the fact that I don't think 34.2mm is a seatpost size... not one that I'm familiar with anyways. In which case chances are your post is a 34.9mm, not a 34.2mm, and that something like this will do the trick:

34.9mm EXTRA LONG EXTENDABLE SEAT POST 530mm-730mm(21"-28") TELESCOPIC ALLOY