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H'mmm. 60 years of progress in technology and we cannot build a reasonably priced and rugged sparkplug? Maybe someone should bringback the Champion VR2(?) or VR3(?) from the 40's. Very good plugs that worked well even with the old simple coil and condenser ignitions systems on 3 volts.
John W.
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It's time to bring back those big toss away cylindrical Eveready batteries for the glow plugs again ...