Up for a challenge

Hi William

It seems that the diameter of the two cylinder part on the top are missing.
(But you can measure it if you print the doc, or with a software like Scanit)

  1. Step 1:

    Top of the main cylinder is a sphere

  2. Step 2:

    Then, a plane correctly oriented

  3. Step 3:

    One of the cylinder, but i don't find the external diameter (!)

  4. Step 4:

    Use a symmetry

    Then, the next part can be done only if you add the inner conical form .

    Hope it will be helpful!