Few things disturb us more than the bewilderment of a broken bolt or seized pipe plug in a casting. You're at a loss for how to get the darned thing out. This is when you have to slow down and come up ...

Bad threads, and repair procedures, right. Broken studs and stripped threads are not always the product of the overzealous neophite. Several factors cause thread damage: Wear from repeated assemblies ...

Few things seem more hopeless than when you’re in the process of removing a bolt, screw, or stud and it breaks. At that point, you know it’s all over but the crying. You’ve busted a bolt off in a ...

Spark plugs that haven't been changed for a long time can become one with the cylinder head. Fortunately, it's possible to repair damaged threads instead of scrapping the head. (Photograph by Chris ...

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Many don't give a second thought to cylinder head bolts once they're taken out of an engine, thinking of them as just another set of fasteners. But they have a much bigger role, maintaining a ...