Autoharp - Restoring & Figuring out how it works

In this video I look at two autoharps I found for sale in need of repair.
I look at one in detail and figure out how it works and how to repair it to a state of playability.
Autoharps are really interesting instruments and allow for some really nice sounds. It works by having many strings which are able to be muted to form desired chords.
I really enjoy find these broken instruments and learning how they work but also getting them playing again. If you also enjoy watching, please do share/like it means a lot to me.
I did buy a tuning key, though it is a little tight and only fits one harp. I would like something a little more robust.
Also please let me know if you have any interesting mod ideas for these, if they need modding at all.
Thank you Dean