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DennisB WiseAutoTools.com © Summary: Brief description of two common Time Sert kits and when they should and when they should not be used. Time Sert 4412 and 4412E are both M14x1.25 spark plug thread repair kits that can do repairs for taper seat and washer type, spark plugs. The inserts are sold separately. Most shops will buy inserts for both that are 3/4 reach which is the most common length so there are prepared for just about any application they encounter. The 4412E (E stands …