Here's a pretty good recreation, though.
https://www.youtube.com/watch?v=RjWD-CnasPc&list=PLGxaqBTVsg...
I've been unable to find the original. I'll keep looking.
https://vimeo.com/254916343
I've still got an original I bought in the late 70s (?) out in the shed.
Here's a pretty good recreation, though.
https://www.youtube.com/watch?v=RjWD-CnasPc&list=PLGxaqBTVsg...
I've been unable to find the original. I'll keep looking.