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One of the more common issues encountered during primary service on Harley Touring models like the 2006 FLHTC is a stripped drain plug thread in the primary cover. Over time, repeated removal and installation — especially if the plug was over-torqued or cross-threaded — can damage the soft aluminum threads.Most Common Repair: 1/2"-20 Thread InsertsFor the vast majority of Harley primary cover drain plug repairs (including most FLHTC, FLHR, FLHT, and similar models), the 1/2"-20 threa …