Extrude curve along curve

Extrude curve along curve. Create a Flat tube change in direction of a tube. Seems simple, but I get a flat center section. The circle isn’t staying perpendicular to my ‘S’ curve.

that’s how the command works, if you want the cross section perpendicular to the S curve, you have to use Sweep1

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It took a couple trys, but I got it done, Thanks