Hi Pete

in sd6 when defining a newel it is the overpass dimension that you enter for the left and right . Your stringer is 38mm  so 90-38 = 52

You have to enter 26 in the left and right offset / Length is 90 . This will give you a newel off 90/90. What about the second newel ? As is the dimension is 146/146 . Is this the dimension you need ?

Have you ever considered to work with SD7 . It is a complete new program and works very flexible. Still in developing fase but better than sd6. Give it a try for this stair and let me know your findings

Do you need the files for this one ?

regards

Michel