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Spark plug stuck-corroded-broken.

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scottly:

--- Quote from: K2-K6 on July 01, 2026, 12:49:37 PM ---
I prefer a thread chaser rather than tap as a decent tap will cut fresh threads or diminish original structure with ease, if not aligned or "indexed" correctly with original thread cut. Chaser is kinder in preservation of original as it has thread form, plus clearing flutes to withdraw corrosion etc all without specifically cutting, accidentally, fresh head casting material.


--- End quote ---
A "back tap" indexes off the (hopefully) good threads at the bottom of the hole, and works very well to repair cross-threaded threads:
https://toolsmithdirect.com/products/powerbuilt-12mm-back-tap-spark-plug-thread-repair-tool-641148?_pos=1&_sid=cf06b0d30&_ss=r

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