I don't understand how the program calculates the increasing and decreasing diameter of the circle when I select "both pointy" from the sweep options. Check the attachment. It seems that the circle starts from zero diameter and ends to the highest value from both ends but not covering the same length of the curve. I don't know if I say this correctly but it is quite obvious that there should be exactly the same at both ends. It's not, as you can see from the image. This must be corrected I think. Even better, this should be adjustable, don't you agree?