I own a puch sdp 280, and saw that you have one as well. Sdp stands for Steyr Daimler Puch. And they were lower end bicycles back when they made them. The old lugged frame is nice though as long as it doesn't get warped over time. Usually in the seat area is the problem. They are very hard to find parts for as I'm sure you've found out. I currently run a modern spacing on my rear wheel for convenience. I know that the thread about your bike is old. Do you still own that bike?