Help me make my polo mallet

Or you could just forget the bolt and stick 2 wood screws in at approx 45 degrees to the pole right near the top of the head where the pole enters it.

I do this too, suprisingly strong and keeps the weight down. When you tighten the screws the head gets pulled off the end if the pole so be sure to leave about 1cm of pole on the end to account for this.