Arghhhhh.... I'm trying to attempt to intonate my RG570 Japan Ibanez 6 String. It has a stock Floyd Rose Bridge (pic enclosed) , but can't seem to get the correct size allen wrench. Does anyone know the true correct size? Has anybody had issues finding the correct allen key, like I am having. My Ibanez has 2 Allen key wrenches attached to back of headstock, but neither one fit the intonation screw.