Figured I owed an update, since I benefitted so much from the thread. I just finished replacing the extractor on my 659. Wasn't too hard. I had a replacement spring from GPC/Numrich which I put in, and I'll take it to the range tomorrow to see how it works.

I can totally relate to the OP. While I was working the extractor pin got away from me. I searched and searched. Turned out it hadn't left the table, but was covered up. I actually have a replacement pin on-hand which I ordered from GPC/Numrich. But I had another similar pin in the same order and they were unmarked, so I wasn't sure which was which.

Anyway, I am very grateful for the experience and wisdom shared here. Really helped. Thanks so much for it.