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Gary,
In days gone by, you could buy a commercial Spark Booster which was simply an enclosed spark gap external to the motor. The theory appeared to be that once the voltage had built up enough to jump this significant gap, it would make small work of the plug gap itself! At the very least you'd imagine this would entail a slight delay of the spark, if not provoke breakdown of the insulation elsewhere. This is likely what your old-timer was doing. I never tried it myself cos it looked more like snake-oil!
Nick
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