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i know its not what you want, but home depot garden stake, 2.70 , was tiniest bit loose in my auger until you put the wingbolt on. I drilled it for the wingbolt and took grinder to make a hex chuck.
https://www.fishusa.com/product/Nils-USA-Cordless-Ice-Auger-Adapter?utm_source=google_ps&utm_medium=cpc&utm_campaign=google_ps&gclid=EAIaIQobChMIuPHP3N7r2AIVWFgNCh3L8AakEAQYASABEgKelPD_BwE&utm_source=google_ps&utm_medium=cpc&utm_campaign=google_ps&gclid=EAIaIQobChMIuPHP3N7r2AIVWFgNCh3L8AakEAQYASABEgKelPD_BwEHopefully this helps!