Derailleur as received from an e-bay selleff who probably didn't know it was busted

The derailleur with pivot bolt and spring inserted, prior to cleaning with acetone.

Anti-rotation washer, and the interior mounting bolt.

...for clarity, I found these photos that I took to explain why I was requesting a refund on e-bay. I did manage to reattach the anti-rotation washer, using the above methods, but have still not used this derailleur on a bicycle I think it will work out longer term, but you never know. Those washers are not over engineered, in their original attachment design.