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Ans:

1. A is the binding point of Flange A or Flange B
2. How to adjust the tilt: After loosening the B screws (4 left and right), you can adjust the head tilt angle
3. C (return to zero ring) and D (scale ring) are not provided by our company, and need to be added by the customer
4. Return to zero point, please calibrate the machine before riveting on the return ring