Original poster: "Dr. Resonance" <resonance-at-jvlnet-dot-com> Be aware that with bolts they tend to burn away faster thus opening up your spark gap. If you don't check and reset it periodically the larger gap (> .240 inch) could damage your NST. Dr. Resonance > > Someone gave me a whole box of 5/16" carriage bolts so I should be set for > a long time! >