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@moog
m7 does exist but it's not ideal, does the bolt currently go all the way through the hdpe and out the otherside?
When I used bolts to make mallets I would drill the entrance hole push fit for the bolt then on the opposite side of the head drill a hole big enough for a socket set head to fit. The bolt only goes halfway across the diameter of the hdpe with the nut tightening against the shaft rather than the outside of the head. Should help to stop things wobbling (and there are less bits of metal sticking out).
Hopefully that made sense.
Also if you don't have dowel just drill the holes for the shaft all the way through head and file the shaft flush with the base of the head.