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)
Top of the main cylinder is a sphere
Then, a plane correctly oriented
One of the cylinder, but i don't find the external diameter (!)
Use a symmetry
Then, the next part can be done only if you add the inner conical form .
Hope it will be helpful!