Does anyone have any idea how to make the geometry on the bottom half of these pictures in MoI?

I have tried doing a curve intersection between a helix and a revolved curve (a sort of sideways )( shape) and then sweeping a tooth profile along that intersected helix with a flat sweep. I'm getting a profile where the "teeth" lean in one direction like this: /// instead of being in-line with the surface normals, centered around the middle of the helix like this: /|\. If I do a freeform sweep it just makes garbage.

I need to sweep along the helix with the profile leaning in the direction of the surface normals, but I'm not sure how I accomplishing this in MoI.

Thanks,
FDP