Hello to all

i want to reverse engeneering one "pseudo" helical handrail originally made in Creo.

i have the guide curve from relief (take-over) taken in yellow

in red i copy the external edge of handrail made in Creo (i have stl file i copy edge with rhino)

in grey i have the sweep surface made in moi

now,
there are some difference
in creo they have adjust surface with some g2-g3 constraints..

how can I do something like this in moi?

thanks