![Spark Plug Gap Closer](https://cdn.thingiverse.com/assets/98/3c/30/eb/59/large_display_Spark_Plug_Gapper.png)
Spark Plug Gap Closer
thingiverse
Gap Closing Tool for NGK 97968 Plugs or Similar Models. I used an M6x30 Hex Head Bolt and Nut, which I think was the case. The actual outer diameter on threads measures 5.8mm, so I'm not entirely sure what size it is.
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