NURBS help?

I used dupliframes to copy a circular NURBS surface to make one ink in a chain… However there are two big holes at the end of the NURBS object after skinning… this makes the tube look hollow does any one know of a way to “cap these holes”? In other words I want to fill these holes up so that the object wont look hollow… do you know how I can do this?
I attached a picture of what it looks like now… see the holes in the end of the tube?

Another problem… why did the tube stop there? I placed the NURBS circles in a way that should make the two ends join… why did they stop before joining up with each other? how can I fix that? thanx


try to increase the values of ends U and V i think this solved the problem