Thanks Gaieus, Sorry about the terminology - model next time. Regards John L

Glad it worked for you. For what it's worth, I didn't find any need to scale up but perhaps you are using more and thus shorter line segments in your curves than did I.

there are still manuals for previous SketchUp versions. downloadable and may be ready anytime for quick reference if the internet fail. Downloading the manuals for version 7 or 6