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For the 18″ base NexGen mills leadscrew Y-axis.
The brass tube size for leadscrews is 5/16″ OD x .272″ ID x .0272″ Wall thickness.
Spindle “Tommy” Bars are use to aid in the operation of opening and closing scrolling chucks and in the headstock spindle to provide leverage when unthreading tooling. They have a diameter of 5/32″ and are 3-1/8″ long.