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Cheers for the replies everyone - very helpful and enlightening. It sounds like it is likely to be a jacobs taper rather than a screw. My plan is to try and confirm this by looking for details on the chuck as suggested by Housey210, then soak it with penetrating release oil as Bingyman...

I think you're onto something here! I googled 'chuck arbor' as you suggested, and they do have a little hole in the top, which is what I can see when I look inside the chuck on my drill.

Yeah, I've tried it, hoping it would do exactly that. It didn't allow to be remove the chuck, but maybe just because it is so firmly secured. I'll probably remove the screw (again) before trying some of the methods suggested above.

Thanks Housey - there is something written there so I'll give it a brush as you suggest and take a look!

Thanks, throbscottle. That's interesting, and it would follow (probably) that they used the same fitting. Is there any way that I can tell (by looking at it) if it's tapered or threaded? I'm up for giving it a try, but it seems a rather violent method to apply to a 50-odd year old bit of kit if...

Thanks, this sounds like a good way to go. I'll give it a try!

No, no screw inside, unfortunately! There is *something* in there - you can kind of make it out in the photo in my original post. The very bottom of the chuck interior has a kind of circular recess that almost looks like a pin of some kind. It might just be the way the chuck is constucted, of...

Thanks for the replies, everyone! Cheers, Bingy man - I'll try that. When you say "soak", does it literally need to be submersed in oil, or is regularly giving it a spray sufficient?

Hello there, I recently acquired an old Wolf 'Heavy Duty' drill. It works fine, but could do with a bit of general TLC and cleaning. However, I cannot work out how to remove the chuck. I tried the method of putting an allen key in it and hitting it with a hammer to loosen it, but that only...