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51 Merc has it right. Because this is a taper, it's best to strike the side of the joint. Use a BFH on the other side to hold it against the blow. Perhaps you can use the tool shown above by drolston at the same time. The extra force certainly won't hurt. I know it seems that beating on the threaded end should do it, but many years of experience by many mechanics support the strategy of getting a good hit on the side. And, it's very important to have a big heavy thing (BFH/5 lb maul) on the opposite side to beat against.