Add an Edit Poly modifier and select the top and bottom eliptical edges (Tip: select all edges and deselect the middle ones in the front view)
Go down to Chamfer dialog box, set the Amount to 0.3 and hit OK
Freeze the object we just created and start a new one by placing, in the Top View, a circle shape with a Radius of 9.5, and 64 steps of Interpolation. This circle should be centered to the other object, seen from above for later ease of use.
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