Latest update - I got the "production" prototype from Xometry this afternoon.
I installed an old ribbon out of a busted cartridge and have been running tests.
John will need to do a few tweaks for the volume run, but it is looking good!
Photos at the bottom of this page
https://www.navy-radio.com/tty/ugc136/ribbon.htm#print

Nick England K4NYW
www.navy-radio.com