Original poster: "colin.heath4 by way of Terry Fritz <twftesla-at-qwest-dot-net>" <colin.heath4-at-ntlworld-dot-com> hi all, how do i build a rotary spark gap i understand the principle but do not know of the small bits like connecting and how much to machine of the motor to make syncronous? also what role does the strobe board play ? does it keep motor correct? any help would be great colin heath(again)