If I could find a 27.2 x 600mm post that might also work, as I could use that for my upper, and when the telescoping post was fully collapsed the 27.2 dia portion would extend out the bottom of the 33.9mm section the required distance to act as a support foot.
Originally Posted by
Plainsman
You are correct, the binder at the uppermost part is the 33.9mm tube slides over the top of the tube, which is reduced to receive standard 27.2mm seatpost.