Here is a demonstration of how to make a knob in blender , the basic procedure , showing that its quite simple.
Not a tutorial that you could follow as such but might raise some questions that I would be happy to answer.
I plan to do some proper tutorials in an attempt at giving back to this great forum :)
If anyone is interested that is ? Could also do a tutorial on Photoshop to After fx as well as Illustrator to After fx for vectors.