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We recently had a customer call us, that was understandably confused about a Time-Sert thread repair kit. He had purchased a different kit in effort to save money, a smaller less expensive M18x1.5 (Kit #1815), assuming that "M18x1.5" referred to the size of the tap needed for his blown-out spark plug hole. Honestly, it’s a very easy mistake to make. If you pull the tap out of a standard M18x1.5 kit, it has M18x1.5 marked right on the tool. However, there is a massive technical difference b …