I purchased a "new", larger lathe chuck on eBay a while back and it arrived yesterday. I'm pretty happy with it. I will probably want to remove it from the back plate and take a really light cut on the back plate, then clean everything, and reassemble it. The "new" chuck is much tighter and smoother than my previous one; I think it's probably a better quality chuck. My previous chuck is a 6 inch and the new one is 8 inches. What's the connection to rocketry? Well, bigger rockets of course.