I hv a 2010 ric 4003 and lately the neck is starting to bow. I read from the menu that this bass need a 1/4" wrench to adjust the rod. After reading "joey's ric bass notes"(http://www.joeysbassnotes.com/Rick maint.htm#tra), i still hv some questions. Does he mean that the dual truss rods could be treated like seperate necks? Like checking the relief of the 1st half from the E string, adjust if needed. Then check 2nd half from G string n adjust again if needed. What does the wrench needed for truss rod adjustment look like? It says 1/4", but in HK the hardware stores doesn't seem to sell it, they offer me some other options, but i'm not sure what wrench I'm looking for. Has any1 got a photo?