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1. If the picker is not already aligned in X and Y, do perform that alignment first.
2. Home the spindle using the pulse picker interface (mode 7).
3. Open the pulse picker using the GUI.
4. Ensure that you have a way of shining light through the picker, and a way of detecting it.

5. Now, start to nudge the picker spindle in the positive direction by entering into the expert command box, followed by <Enter>:

   Code Block
   1MR 5

   In this command, 1MR is the command for "move relative", and 5 is the number of steps to move from the current position. You can enter any number of steps for this command. You can also enter -5 if you want to move in the negative direction.
   The objective in this step is to move the spindle to the point where it just interrupts the light. Once the spindle is there, record the current position in motor steps, which is on the expert interface as C1 (click it to refresh). Let this number be XA.

6. Nudge the pulse picker spindle in the negative direction by issuing issuing in the expert command box:

   Code Block
   1MR -5

   ...until the spindle again just interrupts the light. Record the current motor position C1, and call this number Ynumber B.

7. Compute the average of A and B, and call that number C.
8. Compute a new motor offset Mo by taking the existing motor offset Mo (from the GUI, click to refresh) and subtracting C from it. For example, if the current Mo is -250, and C is 5, then the new Mo = -250 - 5 = -255.
9. Enter the new Mo value into the box directly adjacent to the Mo readback, and press <Enter> to send that new value to the motor.
10. Press the SAVE button in the upper left of the GUI to save all parameters.
11. Home the spindle again using the interface.
12. Repeat steps 5 and 6 to ensure that the spindle is now centered (A and B should be almost the same). If not yet centered, repeat steps 7 through 11 and re-check.