I have used the Time Sert to replace the stripped threads on a bikes drain plug. They make these thread inserts for all types of applications including oil drain plugs and spark plug threads. They are a complete threaded insert not just separate threads like the helicoil. They cannot be tightened too far in or come out as they lock into the hole you tap. I HIGHLY recommend them BUT they are very expensive ($100.00 for the kit to repair the drain plug on the bike but they come with the drill bit, counter bore tool, inserting tool, and 5 inserts in the size) The repair in the aluminum case of tghe bike where the drain plug is went very well, was easy to do and was a permanent repair leaving steel threads instead of the aluminum that were from the factory and best of all....no leaking oil!