Danger! High Voltage! Fits: M5 .80 20 screw and nut (Medium Size) *Be sure to file down the bolt for burs that would interfere with plasma discharge.* I gave enough room for adding in connectors. also possible corrosion? I still may make a smaller one? Depends on how hot this one gets.
Please refer to the following link for Spark Gap Distances. https://www.cirris.com/learning-center/calculators/50-high-voltage-arc-gap-calculator This setup you can adjust from (0-8.55mm)