[Vwdiesel] Glowplugs with a "GAP" like a sparkplug ????.

[H .Hagar]

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Hows about that one Charlie Brown ??(Roger Brown) Just as I thought I had the glowplugs down pad--then this.
I am quoting chilton's  Manual # 7917.      Glowplugs have a built in gap that prevents them from burning out .WOW am I ignorant or what ?.
Someone please explain abut the GAP.      Hagar.
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