I am glad some of you liked this idea. I have a couple other sites bookmarked on my other computer, that talked about some other ideas for the container and adapting it to the part. One guy used a PVC pipe tube for a cylinder de-rusting job, etc. Basically if the part and the sacrificial anode can fit into a non-metallic item, and it holds water, you can take the rust off. When I think of the awkward stuff I've tried to wirewheel /forums/images/graemlins/tongue.gif, this wins hands down /forums/images/graemlins/laugh.gif
If you hit a search engine with something like battery charger rust removal, you'll see this is a popular topic.