conical helix

So, I've been trying to make a realistic ionian column and the main feature of those is the volutes. They have some unusual geometry and I am stuck because Onshape refuses to make sweeps that intersect themselves. Does anyone have suggestions? see the volutes on the photo for reference

Hi all, I'm trying to create a helix around a cone with its starting point relative to the smaller end of the cone, but I can't seem to figure out a way to get onshape to do that. I want the helix to start from this position: ...but as you can see, since the start angle is 0 deg, the helix is actually being generated from…