Damaged threads in cylinders or engines can become major problems, which is why we recommend thread repair kits, e.g. this one from Motoforce.
Included in the set are a drill bit to drill out the original thread, a tap to re-tap the thread, and an installing tool for the inserts as well as 20 thread inserts. The set is stowed in a plastic box.
The thread inserts are also available individually as replacement parts.
This set consists only of high-quality tools that have nothing to do with similar looking Chinese products.