man, seems like at every turn there is a problem.it's so frustrating as a newbie trying to learn this application alone. i know exactly how i want certain thing to look but i just don't know how it can be achieved. i don't want to keep posting new threads but i have nowhere to turn

my problem #4821 is this. i'm making a model of my glasses and i'm stuck in 2 places.

1. frame. i made a long cv curve and a ring and extruded to make a tube. the problem is, the ring stayed in same position on the tube so when the frame curved, it made a knot. see the picture below. how can i fix this, so that the ring rotates with the curve?