Follow Me starts and ends the extrusion perpendicular to the first and last path segments, respectively. The segment of your arc where it meets the flanfe is not perpendicular to the face of the flange.
When I need to do this sort of thing I start with a circle that I rotate so there is a segment perpendicular to where I want the extrusion to end.
If you share the SketchUp model I’ll make an example for you.
Please complete your forum profile with SketchUp version, operating system, and graphics card model.
Good deal. The thing about the path end segments and extrusion ends being perpendicular is important to understand as it comes into play in a lot of ways.
Regarding your suggestion of starting with a circle:
My circle meets x axis mid segment and y axis at the end of a segment so rotating the circle by half segment (6 degrees for a 30 segment circle) does not make face perpendicular to the path. How can make my circle so that this doesn’t happen?
Then you are using an odd number of segments for your circle. Or you are pulling your circle off axis.
It is standard practice to use a multiple of 12, this also allows the Cardinal points to be easily accessed.