Ksisler, that willy wodger was a custom job by Aldo at Quantum in North Perth. Quantum sell the occasional bike but seem to focus on major bicycle repairs and modifications eg frames and forks, uncommon wheels etc. I guess you could find a similar shop in your area and show them the photo of my willy wodger and ask if they could make something similar. Maybe a general engineering or fabrication shop would be interested. Expect to pay >USD100 for a professional job. As mentioned above, we had originally thought the old seatpost would have to be melted out of the frame, ruining the paint on the back part of the bike, which in turn would present an opportunity to braze on a new hanger, but this didn't come to pass. I also had an idea that the barrel adjuster could have a slot for QR of the rear brake cable, but it wasn't worth going to the trouble because the cable guide at the captain's seat-tube is not slotted