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Some will laugh, but I have been doing this for a long time with perfect results. If you identify a tappet that moves, you can readjust it and then hit the threads with some brake cleaner or carb cleaner from an aerosol can to clean the threads. Mix up a small bit of JB weld, and put it on the lifter threads right at the lifter thread junction. Just a dab will do it. It will stay there, and that adjustment is set until you break the bond with a wrench. Lifters never unscrew, they only turn in. The JB will not let the bolt turn in.
I use the Carburetor cleaner from Walmart, $1.79 a can. Works good for cleaning paint guns too.