Oops, sorry... about the screws; yes, you can use aluminum screws without anything bad happening. That is a good way to attach the wire, but not so good of a way to keep acid out of a passage.
Yes, where the wire is attached, it will show a place where ano does not occure, so be thoughtful of where and how you attach wires.
One thing that works well for me is to use the aluminum grounding wire available from radio shack... it's a heavy gauge wire that can be threaded with a 6-32 die, then just thread the wire directly into a threaded hole.
The other size wire I use is .035" aluminum welding wire. It's pretty easy to come by, and works well for wrapping and twisting tight around outside threads like barrels.
Of course the ideal attachment method is with a sput welder, but I haven't worked my way up to that yet. :P
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