Original poster: "Godfrey Loudner" <ggreen-at-gwtc-dot-net> I was going to get this for the core, but it hit me that its probably made of ferrite. Someone who knows how could wind up a super fly back. http://cgi.ebay-dot-com/ws/eBayISAPI.dll?ViewItem&item=2583517301. Godfrey Loudner