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The Top 5 Best Spark Plug Thread Repair Kit Shown in This Video: 5. ▻ OEMTOOLS 25647 Spark Plug Saver Kit Please Like, Comment, and Share. Be sure to subscribe for future videos. Don't forget to hit the bell icon for notifications. YouTube helicoil spring, we can use this where the thread is weak. So, how do you replace the threads on an engine block? It happens: a speedy repair, a bit of carelessness, and the threads are ...