Model the baluster in 3D with a slab to the desired shape.
Stand it up (morph it to be able to free rotate) and place at the project origin or place the user origin at the base.
You will want the bulge to be along the X-axis I think.
Now save this as a custom railing post object ... File menu > Libraries and Objects > Save Selection as… > Railing Post
It should now be available in your railing object as a custom baluster.
I am not sure if you can do something similar for the post on the corner to get the scroll at 45°.
Barry.
One of the forum moderators.
Versions 6.5 to 27
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