The stem in the picture is the old setup. Had two new ones made last autumn. One is already installed on this one:
the longtail is waiting for a new headset before I install it, but both are ready made.
Actually the present stem and the new stem is much the same. Both are old seatposts from these bikes, used upside down. Present setup is held in place with a clamp abowe the headset (since not much is inserted into the fork). There is a star nut in the fork like on a ahead setup and a long DIY threaded rod and quick release at the top. Ok for riding, but slow to dismantel.
New stem is same seatpost but with a piece of a quil stem welded to the "seat clamp spot". Long DIY threaded rod innside to a quick release (or maybe the plastic nut since it is lighter) at the top. No star nut, but the same top as you find on a ahead setup.
The two new stems on the bikes are not the same size. The one on the black folder are the right size (and steel, so sprayed with silver rattlecan). The one for the longtail is chrome and slightly smaller. I use a shim made from a soda can between ahead stem and the (seatpost) stem.
You can see both the new stems in one of the pictures, one is welded the other one is not. This is to show what pieces it is made of. Pictures of stems are a bit old. Should get some newer pictures taken.