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For the price of a chuck I got a cheap russian brand 3/4 chuck mixing drill when my Hitachi smoked. The guy said the guys working on the wharves were welding the chucks shut 50mm ship augers in them and using cheater bars to bore the piles, its held up so far for me.
 

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I don't think one would exist - not that I looked to check.
Chuck size is relative to tool limitations , hence there are 1/2 , 3/8 etc chucks.

I can see going from large to small. but not small to large...
 
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