Do you have any pictures of the finished product?
Sorry, no. I should have taken pics and posted it. I seem to remember that at the time, all I had were the small snap on toroids that Radio Shack sells. If that's all you can find, you can use more than one (which I think is what I did). Wrap the wire as many times around one as you can, close it up, then do another one next to it. Do more than you think you need.