Need help trying to create a simple part

Hello I am very new to Sharp-3D and actually I am totally new to 3D mechanical drawing, so far I really like Sharp-3D and it appears to be very intuitive, however I am struggling to make this simple 3D drawing for a aluminum tip that I am trying to have manufactured. I created a drawing on Sharp-3D but I seem to be having an issue with getting the long tapered conical shape shown on the original drawing on the right of the attached screen capture, the best I can do is what you see on the left hand side of the screen capture. Any help or suggestions would be greatly appreciated.
thank you

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Have you tried sketching the profile then revolving?