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Glow plugs are often improperly threaded by the factory and installing one ruins an engine’s head. Re-threading all plugs with the Higley Glow Plug Die eliminates the problem. The Higley 1/4-32 die is less expensive than a head, especially one from a four cycle engine. Higley also has available a reasonably priced tap for the uncommon 1/4-32 thread used on glow plugs. Made for Higley by USA’s largest tap & die company.