Thank you for reminding me that this exists. FYI, it is out of patent and Mr. Waters is now deceased so, one could ethically and legally make a copy. (Patent no. US-3896696-A)
I’m intending to make one for myself at some point, as I THINK I have all the necessary tools at the Makerspace.
EDIT: Just investigated a bit. I absolutely do have access to the tools!!! Now, just to get in to practice TIG welding so that I’m not terribad at it.