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Back when real Johnsons were twenty books from Joblot, I never used anything on threads or had one loosen in use. They just worked with no fuss. Well, no fuss except a little swearing at the little wrenches...
In flathead repairs, they took over the market as soon as the parts price started looking good compared to labor cost of measuring, welding, and grinding.
Elaborate means remained reasonable for racers looking to save the slight extra weight of hollow adjustables over stock Ford, but as mechanics' wages went up adjustables were a real savings.