I followed Sheldon's instructions and made a spark plug hub locknut tool. Grinded off metal crimp, removed guts, repositioned side electrode. I see how it might work. Unfortunately my plug slightly narrow unable slide over ⅜" rear axle. Need to find plug with larger inner diameter.Sheldon brown describes substitute for locknut tool, "A serviceable substitute can be fashioned from a spark plug by chipping out the center electrode and cutting back the side electrode so that the stub engages locknut slots."