That is what threw me. I knew quick it was a hole in the crank and that was a rod bolt, but what does not make sense to me is "how". The rods are off center of a crank by a good margin so I am scratching my head on how they would show up in the pic through the center of the crank....maybe it is the angle of the picture...new news to me on how they stop that hole up...learn something everyday.