Bend a 50mm bar in Rhino 4.0

Problem is when i do the bending it doesn't line the two ends together properly. I have taken the snap off and used the angle function to 360degrees. If i go further than the 360 degrees it starts straightening out at one side.

Use the Flow along surface, with a plane as the first backbone and a cylinder as the second. You need the original backbone to be exactly the same size and perfectly aligned to the bar's main axle. The width can be larger than the bar's but must be the same as the cylinder's height. The cylinder should have a diameter of 15.91549430919mm (50mm/pi). - Ricardo Rhino Newsgroup