driller
Dedicated LVC Member
Tip: Use a thin metal shield between the ground electrode and the center electrode to protect the center electrode from the file. I used a small paint trim shield.
Lightly clamp the spark plug in a vise or use a small C-clamp to clamp it to a bench or shelf. File the ground electrode back at least midways to the center electrode. I used a small 3 sided file. Then round off the square end. Finally, smooth any sharp edges with emery cloth or crocus cloth and inspect carefully. Be sure to recheck the gap afterwards.
Lightly clamp the spark plug in a vise or use a small C-clamp to clamp it to a bench or shelf. File the ground electrode back at least midways to the center electrode. I used a small 3 sided file. Then round off the square end. Finally, smooth any sharp edges with emery cloth or crocus cloth and inspect carefully. Be sure to recheck the gap afterwards.