[QUOTE=maddog34;23339793......one respondent even said his 9/16" wrench would fit the 15mm nuts...
time for a new 9/16" wrench, or new nuts eh?[/QUOTE]
That was an EITHER/OR statement referring to poorly manufactured nuts.

Just EXACTLY WHERE does ANYONE say THEIR 9/16" wrench fits 15mm nuts? A 15mm nut would take something in the range of a 22mm wrench.