I recently changed the chuck of my Delta DP. I needed to change it because it had one of the less expensive chucks; and the jamming, excessive run out they tend to have. I started out looking for a Jacobs (USA) and they aren't all that available (though I did find Grainger carried them). I found this
LFA chuck instead. Not a well known name, made in France, but very high quality for a little less money. Now, to be honest I did buy the 5/8" (16MM) size, but didn't use it. I returned it and got an LFA 3/4" chuck. I've never needed more capacity, but figured if I was spending the money, might as well do it up. I was a little surprised at how much that 1/8" added :laughing:. That's my Delta 5/8" next to it. Oh yeah, you'll need to make sure the new chuck has the same taper as the old (or a new arbor). Those are called Jacobs taper, and my 5/8" had a #3 JT. The new chuck works very smoothly, and I now have .004" of run out (it was .015")