Gonna admit it, I suck at hanging handles.
I've successfully done an axe, grub hoe, and shovel. But hammers are my kryptonite
A did a smaller sledge years ago, and took 2 handles to get it done.
Trying to hang a 10# sledge now. First time I took off too much material at the end of the handle, eye went in too easily for sure.
Second time everything pounded together nicely and even looked good, but I got about an eighth/2mm of movement if I slammed the head on the ground
I don't think I drive the wedge down far enough, and I can't adjust it due to the round metal wedge.
Sticking with flat metal step wedges
Maybe I need some epoxy and a fiberglass handle!