Bridger wrote: I ended up using an old motorcycle charger, which works fine, but slowly.

From what I've read you can actually do a "better job" using a custom
built power source. There's a web page out there that gives you the
instructions. I'm not sure how it's better, but I think he said that
it converted more rust into metal or something like that. A rusty old
battery charger has worked fine for me.

JP