Create lines in dynamo and convert to beams in revit

Im using Dynamo to create a truss in Revit that can be easily flexed in terms of length, width, no of bays etc. I can create the lines and get these into Revit easily enough but i dont understand how to convert these lines into beams - can anyone tell me where i am going wrong?

Any help gratefully received.

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Plug the linebystartpointendpoint straight into the structural framing node. Remove the model curve node, that should work

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That did the job - I don’t know what I was thinking - thanks!