Hello James,

I'm glad that it works:-) and an aesthetically result, also. An idea that I got, while I'm looking to the pictures: If you want to control the diameter depending on the curvature of your rail, I have made a node for that in the Infonode.js. It calculates the minR and maxR of curves. This could be used to avoid squeezed surfaces. I didn't made a tryout, but maybe also an interessting experiment:-)

Have a nice day
Karsten