I created the intersected curves and then connected the top ends to each other, I also connected the bottom ends to the circle extrudes. They all have equal curvature relationships. I created a small circle on one end which the center point is coincident to the center of one of the circle extrudes. When I try to use the Sweep feature, it wouldn't allow me to use the 3D sketch. Could someone please point out where I didn't do it correctly? Is it the because of the connection ends?