Original poster: "by way of Terry Fritz <teslalist-at-qwest-dot-net>" <Pomnept-at-aol-dot-com> Thanks to you helpful people, I have tuned my Tesla coil and it works! Can anybody recommend a good method of attaching the toroid to the top of the secondary so that I can move it up and down and change toroids without too much trouble? Thanks in advance. Robert Hanford