Drawing router decoration in wood

How do I draw the decorations on the fencepost in an easy quick way?
Feels like it should be so easy but cannot find a way.
I guess solid tools is a part of it.

To draw a sphere first and then connect to a half pipe does not seem to be an effective way.

Using Follow Me Tool


Here’s another option, it goes a bit further than just making the shape, so ignore the rest if it’s not interesting.


Wow! Thank you so much!