Hi Michael and Shayne,

I'm too embarrassed to attach my original working files as they are all over the place! However the epiphany has been to select my name first before starting the flow operation. The other area that puzzled me was the unwrapcurve which I found in an earlier post and promptly downloaded and copied to my command file (I think). Anyway, the combination of clarifying those two points has got me on the road to a ring...I think! Thank you so much for your patience, I am learning more than I anticipated in this one exercise: