What is the best way to make a 3 jaw chuck accurate? I made a test bar using 7/8 drill rod about 4" long in my collet and it runs true. When I put the bar in my 3 jaw it has .028" runout. I have a burned chuck with a L00 taper on a Clausing 13" lathe. Is there a way to adjust the chuck, or do I need to cut the jaws with a boring bar? Thanks for any help.