Change the left view to a right view. In this way we can see the circular shape of our spline. Now create a circle (spline) in the center of the circular section of the spline like in the image. You need to convert it into an editable spline to be able to work with the vertexes of the circle.
Select the vertex like in the image, and BREAK it. This will split a single vertex in 2 vetexes and break the circle.
Select the upper vertex and move it to the right side. Transform the vertex with a right mouse button click into a CORNER vertex.
Move the lower vertex like in the image and use the Bezier (also Bezier-corner works very good in this situation).
Now select SPLINE and MIRROR it with COPY. Move the copy to the opposite side of the chair. Move it only in the X axis. You can mirror the spline from the modify panel or just using the Mirror tool. If you use the Mirror tool you have to ATTACH the two splines to be able to weld the vertexes.
Select the 2 vertexes. Now go to the Weld button. Insert a big number in the weld slot and click weld. The number you must write in the slot must be equal or bigger than the distance between the vertexes that you are welding. The easiest way is just to write a very big number like 100000.
Now select SPLINE and outline the spline.
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