Beyerdynamic Custom One Pro - What size are the hex screws?

[DrGonzo]

Hello Head-Fi'ers,
 
Anyone know what size the hex screws that hold the outer ring on the Beyer COP's?  I just received by COP's that I ordered from B&H Photo today and a couple of the screws seem to have rust on them, which kinda hinders the looks.  The headphones appear to be brand new (at least they were supposed to be), no signs of opened box or wear.  It looks like I can order a replacement screw set from Beyerdynamic, but I don't want to pay the $15 flat rate shipping.
 
Any help would be greatly appreciated.
 
BTW, the headphones sound great!!!

 

[PurpleAngel]

Try asking in this thread.
http://www.head-fi.org/t/604570/beyerdynamic-custom-ones-new-beyer-headphones