Been wondering for a while about these 2 questions,thought I'd post and get the answers. I have a few New Way coils, one tag says "adjusted for dynamo" the others say "adjusted for 4 dry cells".Now I know one is for friction generator, and one for battery, but just what would be adjusted and how? 2nd question is I read New ways had "special" 1/2" thread sparkplugs, for a while then went to "standard" 1/2" plugs. Would the special just be a longer thread plug? Thanks-Neil.