J-O, I would suggest that you might consider showing samples of what you are doing, either full or partial drawings / models. I personally find it much easier to offer advise on a SU situation when looking at the drawing / model. My eyes start to glaze over a bit when reading long lists and I imagine the same goes for some others here. Just a thought! Mike

Keep in mind that SU arcs are imported into ACAD / Bricscad as a series of short straight lines & not arcs. Seasdes