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Overtightning anything is a sin, morons at tire stores using air wrenches set for whatever it was before it got dropped 7 times today leave a LOT of people stranded and tear up studs. it is more important, I think, for a beginner to buy a torque wrench and use it on drain plugs and spark plugs, not to mention lugnuts, than for someone who has developed a feel for such things after many years. You DO need a 3/8 for the small stuff and a 1/2 for the bigger bolts and nuts but Harbor Freight and such places have decent occasional use. Just don't try to use a 1/2 inch torque wrench as a "breaker bar! The things will have paid for themselves the first time you DON'T strip or snap something.
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