As I have always greatly valued vintange tools, I sometimes need to replace the handles. I currently have a small ax I saved for rust and decay. The handle needs to be replaced. I found a good replacement, but I puzzled by two holes in the ax head end. The handle has the normal slit for install the hardwood wedge, but also on 3/4″ deep hole and another about 1/4″ deep. See the photo. The handle came with a standard hardwedge and a standard metal wedge. But no instructions for how the the holes are to be used. 

 

I’ve search other sites on the ‘Net but haven’t found any information. In looking this handle I saw several other with the came configuration. Can someone update me on this configurations or point me in the direction to learn more? Please!