As far as looking for cracks it's easy to mistake cracks in the anodizing surface treatment for cracks in the aluminum. A fact shown to me by Ron Commo Sr. when I asked him about what looked like fractures on a Techno frame. He grabbed a piece of steel wool and ground down that section of frame to bare aluminum. Pointed to the now unblemished bare metal and said, "See, no problem" Not one to waste time that man.