Hi Burr,
my shaft is 4 long x 1 diameter and the helix 4 coils. I used an ellipse 0.3 x 0.5 blank to produce the facets at 50 per coil.
The bottle rotation was 90 degrees over the length of the helix. In addition I added a run in and run out. This was done
by adding a single coil on each end with no rotation thus giving blanks to Boolean of one coil entry no rotation, four coils (Shaft)
90 degrees rotation, one coil exit no rotation.
For the opposite hand helix shaft I rotated the blank 180 degrees to move the seam thinking this will give a continuous facet
edge for lofting.
Hope this helps
Barry.
Ps how did you do your animation?