The steel hinge on my Dahon "Boardwalk 6", 6 speed 20" 2003 model folding bicycle broke. I was attempting to fold the bicycle and was having difficulty, so I pushed a bit harder and the bolt broke in half.
In retrospect I realize should have stopped when I was meeting resistance and adjusted the bolt, as per the instruction manual.
I have put it into the local bicycle shop to see if they can fix it. They can probably make a replacement part fairly easily, but are first checking to see if the supplier has a replacement part.
This is the second breakage I have had with the bicycle. The frst was much more serious, when the frame broke in half while I was riding it. The frame was replaced under warranty and I was very happy with the result.
The bicycle has been across Australia and Europe on planes, trains and automobiles,with relatively few problems.