Thanks! Bryan Loyd's method of casting to an interface seems to be what I am looking for.
However, I get an error in combination with the commercial API: > surfaceCB = ZOSAPI.Editors.LDE.ISurfaceCoordinateBreak(surface) E TypeError: object does not implement ISurfaceCoordinateBreak I will try to get a further hint from the support of the commercial software I am struggling with.
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