DeWalt drill chuck shaft, inner thread spacing?

Anybody know what the inner thread dimensions of a DeWalt 18 volt compact drill might be?
The chuck screws on the outer threaded area of the arbor/shaft (maybe 3/8 x 24 threads), but the inner part of the shaft is also threaded. It appears to be about 1/4 inch diameter, but more than 24 threads per inch.
Thanks.
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Never mind. The inner threaded part helps keep the Chuck from coming off and is reverse threaded, so I could not use it anyway.
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On 2/12/2011 2:39 PM, John Doe wrote:

It'll be a left-hand thread, which is probably best obtained from DeWalt ...
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If you're talking about the threads for the small screw that goes through the center of the bottom of the chuck and into the end of the arbor, I don't know what the thread size is, but every drill I've ever seen uses a left-hand thread there.
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That's so the chuck doesn't unscrew when you're running the drill in reverse.
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Stuart Winsor

Midland RISC OS show - Sat July 9th 2011
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No kidding? Really? You think so? :)
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