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Tutorial by Yang Ji
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Here is how I did it.

  1. Step 1:

    Sketch on front plane
    A few dimensions

  2. Step 2:

    Revolve 180 reversed direction.
    180 revolution will become very handy later on.

  3. Step 3:

    Load toolbox
    from menu
    Toolbox -> Configure
    For how to customize thread, refer to this: https://www.youtube.com/watch?v=DKwnvsM8-xI

    Under Sizes use numbers in the the last row

  4. Step 4:

    Under thread data use numbers in the the last row

  5. Step 5:

    Save and open hole wizard
    Choose these settings

  6. Step 6:

    You should get this.
    I tapped the hole so early because there are things with dimensions to the tapped point.

  7. Step 7:

    Sketch on right plane
    All dimensions are from PDF file except Ø0.4670 is measured in CorolDRAW. Refer to my previous comment for reasons.

  8. Step 8:

    New sketch on right plane
    Convert the line and extend it to pass the revolved body

  9. Step 9:

    Use this one line sketch to extrude cut

  10. Step 10:

    Sketch on front plane
    Tangent relationship is not necessary at top but it can give me a fully defined sketch.
    I recommend finish this step before you revolve the upper cylinders. Otherwise this cut intersect with them and you need to create a reference plane and do extrude cut up to surface, which is more work.
    The small circle in the middle can be replaced with just a point. It is useful later.

  11. Step 11:

    Now you can revolve and merge and leave the center hollow.

  12. Step 12:

    Revolve cut the lower part

  13. Step 13:

    Sketch on this flat surface and the center of this circle should align with the partial circle in the sketch for revolving. That is why I put dimensions in page 2 into that sketch.

  14. Step 14:

    Because I revolve 180 degrees, now you can create a reference plane as pictured.

  15. Step 15:

    Sketch on this new plane
    Convert the edge and use R0.343 from page 5
    Offset 0.284 from page 3
    0.1788056 from page 3 is not used anywhere. 0.27 is hard to tell from what to what.

  16. Step 16:

    Sketch on top face of upper cylinder
    dimensions in page 4

  17. Step 17:

    Hole wizard as pictured
    Position snaps to points in previous sketch

  18. Step 18:

    Revolve cut 180 use temporary axis

  19. Step 19:

    Pattern as pictured

  20. Step 20:

    Now mirror body and merge

  21. Step 21:

    Use the small circle in the sketch here as reference and tap a hole

  22. Step 22:

    Tap another hole here snap to the center of the bigger semi circle

  23. Step 23:

    Chamfer

  24. Step 24:

    Finished feature tree. I do not think I can make it any shorter at the moment.
    I hope this helps.

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