2. Sunwayfoto Fluid Panning Adapter DDH-03i
Essentially the same as DDH-05 shown above. Very Good condition with slight scratches on the surface from normal use, slight friction is felt when rotated (I bought the item new, and the friction was already there), but no practical problem. Comes in the original box. All necessary screws and a hex wrench are included (see the photos of DDH-05 above).
60 USD plus shipping cost.
EDIT on Feb. 25: I found slight scratches, so I downgraded the condition from "Mint" to "Very Good". The edited part is indicated with the bold typeface. Still, there is no functional problem.