Well, I was going to use the plastic shaft from a previous Halloween accessory. The kind you still find on store shelves with red trident heads or other things on top.
But it looked too short. My daughter spied a length of copper pipe I had lying around and it seemed to match her scale close enough. So I used that. (I did need a couple winds of tape to make it snug as I didn't have time to print another...)
You can change the r value in the Shaft() module to match what ever you choose.