I am building a rotorhead for a helicopter. It is a two-blade semi-rigid teetering head, pretty standard stuff. Adams-Wilson or Scorpion type with elliptical hub, bearing blocks, and blade attachment straps. I have the grain of the metal (6061 T6) in the hub running spanwise. My question is, in reference to the bearing blocks, do I have to pay attention to the grain direction, and if so, which way should the grain run? The blocks are approximately 2 in. by 3 in. by 3 in. The 3 in. direction is from side to side with the 2 in. dimension running spanwise. The securing bolts are 7/16 in. and are drilled across the 3 in. direction. How much does the grain matter in a piece that is pretty much a square with nearly equal dimensions?