I have removed the keyed chuck from my old Black & Decker H264 corded 2-speed non-reverse drill with the intention of replacing it with a keyless chuck. The original chuck carries the markings 10mm Jacobs ⅜" and it has a threaded boss of approximately 10mm diameter sticking out of the back where it screws into the drill's drive shaft. Could some kind person please tell me what type of thread might be on that boss, and what I need to search for on the Internet in order to get a compatible replacement e.g. male or female chuck, thread size and any other essential data so that I get it right first time? Thank you.