Hi All,
I wanted to open up my metal Hohner Piano 26 to try and tune the lowest and highest notes. So I removed all the screws on the back cover, including the handle screws. However, there are three rivets on the back cover and they appear to be preventing the removal of cover. There does not seem to be a way to remove the back cover except to drill out the rivets.
Has anyone ever disassembled one of these, and if so, what is the procedure?
Here are some photos that show the situation.


Regards,
Lowboy