The only thing I can say is WOW!!!
Take a look at these Youtube videos.
https://youtu.be/M8m5gzcByuE
https://youtu.be/0euCWf0FpOA
Saw these utube clips a while back. Smart.
Justine Haupt, 'Engineer' :)
Amazing!
Mike
Justine is an amazing engineer. You can visit her website and access all her projects at:
Justine-Haupt.com
This was posted previously
Here http://www.classicrotaryphones.com/forum/index.php?topic=23691.msg236821#msg236821
then here http://www.classicrotaryphones.com/forum/index.php?topic=23771.msg237344#msg237344