Each shaft has a spine and this part is stiffer than the rest of the shaft. Spine Alignment means that we find the spine on the shaft and install it in line with the direction of the target. This means you get more precision and length in your shots because the shaft bends straight back. Mounting the golf club so that the shaft's spine points toward the target minimizes off-line bending and twisting of the shaft. This improves the chance of hitting the center of the clubface to 51% on a correct swing.