Never start the lathe before checking that the chuck is completely screwed on. Unfortunately, I did just that with my PSI chuck on my Jet 1442 lathe. When I started the lathe, the chuck spun hard against the spindle seat and seized; it is almost as if it welded the two together. I have soaked the parts liberally with WD-40, attached a 12" piece of pipe to the handle, hammered on the pipe, tapped firmly on the chuck itself in hope of the shocking the chuck free, but it refuses to budge. OK, I'm an idiot, but does anyone have any suggestions?