What has been posted already is true. A handle which grains go in the direction of the swing is correct, slightly diagonal is ok too, but cross is bad. What I do with all my wooden hammesr, sledges, and axes is to tape them aswell, some around the top, just under the head and some at the bottom an inch or two, below the end. This helps to reduce vibration which leads to cracking. Summed up, it gives the handle longer life. The tape just under the head of the hammer also helps protect the wood handle from glancing blows, misses. Not that that ever happens...