I purchased the \"TEKTON 2902 Power Driver Extension Socket Adapter Set\" from Amazon and it works well. The local hardware store or home center should have something similar.

Jims, I do already have a set of these driver adapters that are great for using standard sockets with my driver. But I’m looking for an adapter/check that will allow me to use up to a 1/2” drill bit with my driver.

Something like the Neiko 20754A 3/8-Inch Conversion Chuck for Impact Drivers would be ideal – but the chuck capacity needs to go to 1/2” instead of just 3/8”.

The lack of the converter you’re looking for is just the manufacturers’ way of suggesting that driving a 1/2” chuck with a 1/4” or even 3/8” drill motor isn’t a very good idea–you’ll overtax your drill motor. The universe is trying to tell you it’s time to move up to an 18 volt system.  

Something like the PORTER-CABLE PCCK600LB 20-volt 1/2-Inch Lithium Ion Drill/Driver Kit would be ideal, You can check it here.

I don’t quite understand why you need a 1/2” capacity chuck specifically. All you need is some way to grab on to the winding crank, and there is no way it is 1/2” in diameter. It is more like 1/4”. More likely they are just telling you, like a previous commentor says, that you need a powerful drill, of the type that usually come with 1/2” chucks. If it were me, I would get a cheap 3/8” corded drill (not cordless), maybe a used one, and dedicate it to this purpose. Corded drills tend to be cheap and powerful. And because I enjoy this kind of thing, I would think about replacing that wiggly winding crank with something better, maybe with a shaft or pulley system, or maybe just mounting a power drill permanently to the Racor, and running a power cord down to a switch. 

I am very happy with this information. cool math games