Have you tried modifing an ellipse by cutting off 1/3 and rotating it out from the top point , duplicating it with array x2 joining and sweeping the profiles around it
I think you get a better result with 3 profiles as it forces the shape to stay square on and not rotate or twist when swept.
If the bottom profile is mirrored you can easily adjust their offset position for a gap
cheers
shayne
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