Chuck for 1/2" impact wrenches

[Stephen Tashiro]

Where can I get a chuck ( a "speed chuck" or "Jacobs chuck") that will fit on a 1/2" impact wrench?

I need one of these to satisfy my idle curiosity about whether an impact wrench instead of a drill can be used to drive a "Yard Butler" planting auger Amazon.com: Yard Butler RP-3 Roto Planter 24-Inch Long 2.75-Inch Diameter: Home Improvement

Edit: What about the following approach?: Many electric drills with Jacobs chucks have a part called the "spindle" that the drill chuck screws into. Is there a socket of some kind that would fit around the other end of the spindle? Looking at parts diagrams on the site, I can't tell what shape the end of the spindle has. For drills with 1/2" capacity chucks, what does a typical spindle look like, close up?


Edit: Dock builders have the right idea! http://www.dockbuildersupplies.com/p...ge/3998049.htm

Edit: I found an inexpensive version of the chuck: http://www.cowanchuck.com/id1.html That site has a remakably candid video that shows how much harder it is to drill into granite or old concrete than into bricks, stucco, etc.