I have a model of a circular spring (something like this) and I would like there to be an easy way to find/dimension the inner and outer diameters of the whole ring. This would be especially useful in a drawing. I kind of get why SW seems to think this is not a defined dimension, but it would be really nice if I could easily call this dimension out, especially since that would make it easier to use it to drive other dimensions. Is there a way to do this? Thanks in advance!