@Lowhog - nice hanging job - top wedge looks tight and seems as if you picked a haft with nice straight grain! Looks like a House Handle, good hafts... most of the time... Make sure you give that top wedge a generous and repeated coating of BLO. You don't have to let dry and wipe away, 30 minutes will go by and that end grain just soaks it right up. Keep adding to it until it won't take it up any more. It'll swell that wood so tight that the head won't budge at all.
One last thing, and this is just me being picky, but I'd probably trim that wood on top so it's 1/8"-3/16" proud. Sitting tall like that is fine until you start swinging it. If you make a glancing swipe or use it to split, that wood is going to shear off and eventually (potentially) split the end grain. Cutting it flush is the best protection against that, but I feel that keeping about and 1/8-3/16 above and swelling the wood with drying oil just locks that head on there and it'll be on for a very long time.
Overall, it looks great.I have a very similar Craftsman single bit 3.75 lb to hang, probably will be my next project.