Hi Barry,

> I think it would be good to have a check box the same as in the helix
> creation to save confusion as normally these screws are in pairs.

I know it sounds simple to add in a checkbox but unfortunately it can take a surprising amount of time to make it work correctly with testing it. So unless you're blocked from being able to finish that's not something that I'd do right now anyway since it will probably take me much more time to do it than it would save you. I kind of thought that it should work ok on a reversed one, is it that the reversed one isn't centered on the origin maybe?


> Regarding achieving a smooth scroll I have been lofting the facet edges.
> Is it better to rebuild the bottle profile so there is only one seam for the Boolean operation and
> to give a continuous facet edge to loft ?

I'd think so - it would likely be good to reduce the number of edges and segments involved.

- Michael