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impact driver (1/4" hex drive) will be useless here.
impact WRENCH (1/2" square drive) is the right tool.
3/8" breaker bar is good for M8 bolts and not much more. i have snapped 3/8" square drives on big bolts before.
you need a sturdy 1/2" drive bar for these bad boys.
strut-to-spindle bolts often need a 4ft pipe slipped over the 18" breaker bar handle, beware.
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