I'm looking for an easy way to create splines on shafts and holes.  These are the toothed drive splines, not to be confused with curved lines for which the site search pulls up plenty.

Is there any resource of sketch blocks or other tool-box entities that can make this easier?

I'm not designing splines, these are generally being used as a representation on as-built parts for documentation purposes.  Instruction manuals and the like.  So accurate tooth profiles aren't necessary, just the right tooth count and size.