What tool to tighten this strut nut?

[BEETLE]

Originally Posted by atikovi

Replacing the rear struts on the 2001 ZX2. The original strut had a space in the center for a hex key to hold the rod while loosening the nut. This one doesn't. Is there some tool that grabs that odd shaped washer that would hold the rod steady?

Terrible nut and bolt strut design. Not enough space to apply an adjustable wrench.