My EBMM Sterling needs a truss rod tweak. It has a wheel at the base of the neck. It did not come with any kind of tool for turning that wheel. Is there a special tool I should get from some where? I have a bunch of different sized hex wrenches, so I know I have one that could be fit in there, but I'm afraid the corners of the hex wrench will make marks in the wheel holes. I'm pretty sure I also have a screw driver that would fit, but I think all my screwdrivers are also hex shaped. And even if I have a round one, unless it's the exact size of the truss rod wheel hole, it still seems like it could booger it up. My Sterling is a Limited Edition and all the hardware is gold, including the wheel, so I really don't want to scuff it up or booger it up. Help?