Tapered circular tube surface along an arc center line?

using Rhino 7 for Windows, is there a way to create a tapered circular tube surface along an arc center line?? thanks

Art

Hi Art - I’d use Sweep1 here, with ‘Global’ shape blending as set in the dialog.

Align the cross sections to matching Quad points (OSnap) on the circles.

-Pascal

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Pascal-
thanks for jumping in so quickly!! “Global shape blending” is greyed out and can not be selected…? what do I need to do to unlock “Global shape blending” ?

Art

Hi Art - you need to select both circles as input, with the arc as the rail… ? Feel free to post the file.

-Pascal

Pascal-

Thanks, that got it !!

Art