Spark plug tap has a pilot nose which guides and cuts to ensure accurate alignment.
No drilling is necessary because the supplied special tap does the job as you use it.
Can be used with cylinder head still fitted - at your own risk, we have done that several times ourselves.
If you remove a spark plug and it appears to have a thread of 16mm then whoever fitted the insert did not insert properly and the insert has come stuck to the spark plug's own thread.
Similar to Helicoil but made by another company.
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