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You will never throw away a broken engine spark plug The spark plug is one of the most commonly used DIY tools. A spark plug, which is a simple tool, actually has many hidden, unknown and unused functions. This is why very few people know about this buggy feature of the engine! In the video engine spark plug secret, we showed you the hidden features of the engine spark plug, blacksmithing tricks, tricks, tips and tricks. When you watch this video, you will learn how to use an old engine plug and its many useful features.