Part 12 of 18, Restoration of Addo Multo Model 3 Mechanical Calculator

[@davitto01]

Hi, I'm currently attempting my own repair of one of these fascinating machines. I have managed to strip it down to where you had it here, with the black and red counter wheels removed, cleaned up the levers and such. However, the wheels and gears of the 13 wheel black wheel counter to the right of that section is also gummed up. Is there a way to disassemble that section without specialised tools? As I can't see any obvious screws to remove, most of it seems to be rivetted.