Select all edges but the two in the middle of the sides. Chamfer the selection 0.1 units.
Add a MeshSmooth with 3 Iterations to the switch to give it a more natural look.
At the back of the base, on one of the sides, create a Cylinder with the following parameters: Radius: 13, Height: 25, Height Segments: 1, Sides: 24. Then clone it (Shift + move) to get one on the other side as well.
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