I will be building my new mallet soon and looking for a good way to fix with a single bolt in the base without the chance of twisting.
M6 nut in the shaft, M6 countersunk bolt, crown the shaft with the file so that it bites the plastic and can't rotate. Job done.
@H-Bomb started
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M6 nut in the shaft, M6 countersunk bolt, crown the shaft with the file so that it bites the plastic and can't rotate. Job done.