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Buck Adjust Tru 6" 3 Jaw Chuck

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how does one "adjust true"? I know their is the 4 1/4" allen screw around the the 2nd part of chuck! When I screw on to spindle (Logan model 200 lathe) I get .023 run out on out side dia of chuck same as what I get when I chucked a 3/4" drill in to jaws! The lathe spindle has less than .0005 run out!

I took chuck apart to clean and lubricate I punch marked the 3 parts, the jaws are in their correct locations, the pads for the adjusting allen were installed at bottom of allens!
Turning the...

Buck Adjust Tru 6" 3 Jaw Chuck

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