George,
Use a 10 mm, 3/8" drive hex drive bit and a 4" - 6" extension on a 3/8" torque wrench ... on all twelve barrel nuts for the bottom-row studs . Test at 24 lb-ft setting.
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Warren Hall, Jr.
1973 911S Targa ... 'Annie'
1968 340S Barracuda ... 'Rolling Thunder'
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