I'm trying to model an existing expansion loop on a steam line. Known geometry (radii are given) - Large radius on 1st bend, smaller radius on 2nd, a straight run, then same smaller radius on 3rd bend and same larger radius on the 4th and final bend. In the 'x-z' plane. I want to add +Y-restraints at the 1st bend (start), 2nd bend (middle), 3rd bend (middle), and 4th bend (end). When I add a '+Y' to various nodes in the bends - they are hanging out in midair according to the model. Methods so the '+Y's are back on the pipe? (Consider adding to your Expansion Loop tutorial)