Terri, i haven't checked, but i don't think there's any big difference between the file sizes . In the two cases, it's just a spline object with a spiral extrusion and two sections . Mark, the reason i've made this tutorial was because someone asked me how to do and i was lazy to dig into the archives here ;) Peabody, don't you see the little flaw that does like some kind of zig-zag ? Well, it's probably because it's not obvious :) . Again, great technique and thanks for sharing !