I just bought an Agile 728 Interceptor and it's a great sounding guitar but I'm noticing quite a bit of fret buzz, and as I was going to adjust the truss rod it wouldn't move? The neck needs quite a bit of relief and the Allen key isn't going in other than at the very edge of where you'd turn to give more relief but won't move, and that's the only spot the Allen key will go in. It won't go clockwise anymore since it's too tight so it may snap or whatever if I push it further than it is right now. I've set up many guitars and I've never had this problem. Why won't the Allen key enter the truss rod hole? Please help, or if I'm doing something wrong correct me! Thank you!