Think you are going to either look for an exit port on the frame lower down, or I'd drill about a 1/4" hole at the top rear of the seat post to thread the wire through. You'll have to put something either around the wire where it feeds through the post so it doesn't abrade or put something like a rubber vacuum line hose around the wire or stuff it into the hole to protect the wire like a grommet. Then put a cable or wire down through the hole in the seat post and tape it to your light wire and pull it through as you insert the seat post. hth.I tried starting a thread about this but got no response. Those of you who have installed a suspension seatpost, like a thudbuster. How do you get the light and cable out of the existing seatpost and how do you move the wires to move the light when you can’t put it through the seatpost?