I'm trying to model the image of this control knob which has a curve to it. I start off with a cylinder as shown in the example I've attached. select 4 vertices and make a face in the middle of the knob. But I also make another 2 faces left and right so I can make the bevel. When I select the edges and do make the bevel, as seen I'm getting some odd mesh result appearing. Is this the correct approach to model the reference image?