I think this will work for replacing the ribbon in an original UGC-136 cartridge. Either a new ribbon or remove, re-ink and replace an old one. 

https://www.navy-radio.com/tty/ugc136/ribbon-r-r.htm

The 3D-printed cartridges don’t need this mod, because we changed the design from the original. 

Nick England K4NYW
www.navy-radio.com

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