If using the tubular box type spark plug spanner, think about either welding a nut to the end or sliding an old 3/8" drive socket down the end & then welding it in place through the two opposing holes where you'd normally put the leverage bar through. Either option will allow you to use a Torque Wrench & avoid stipped threads. The welded socket is my preferred option & retains the standard length of the spanner, meaning it still fits in the original tool tray or tool roll.
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