I had a cross-threaded O2 sensor, so when I finally pulled the sensor out where the threads used to be was a mangled mess. I struggled with the tool for a while because it couldn't cut the threads to rethread the cat tube, so out of frustration I tapped it a few times with a hammer to get it in. I decided I had nothing to lose. if I had destroyed the tool at that moment. I don't recommend this as the tool was never designed for this type of use, but it worked great and the tool is still in great condition.
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