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Help placing helix on surfice of irregular cylinder


New member
I have hit a wall in my attempt to place a helix on an irregular cylinder shape (shape bulges in middle and narrower at beginning and end). I am attempting to build a fluted dagger handle. If the cylinder remains the same diameter its whole length it is easy. In my attempt to draw a helix around a cylinder of varying diameter (I'm not sure you can even technically call that a cylinder) and then use Curve->Curve from objects -> pullback I get close. However, if the change in the diameter of the cylinder is significant I get odd results.

I'd appreciate any help on this. Thank you.