shows a slick way to avoid threading toward a shoulder. Apparently due to viewer feedback, he added this warning to his comments: "To all my viewers. Please exercise caution and use good judgement when running a machine with a true screw on chuck. Excessive spindle load with the machine in reverse could potentially unscrew your chuck causing damage and personal injury. Refer to your operator or machine manual for safety suggestions." My new Grizzly G0602 has a thread on chuck. There are a couple of clamps that should keep the chuck from coming off. But if it moves at all, the work would be ruined. Any suggestions? Locktite? I will make a reverse tumbler. And the threads I want to cut are 24 tpi x 1.375 OD in aluminum. Probably 7075.