This Comptometer model H got refurbished, again, in 2023 :)
And then the whole machine is put together again, clean and cosmetically very acceptable.
However, the column 6 had been malfunctioning - caused by sticky old lubricant. Closely watching what was going wrong to identify the cause (peering into the mechanism, operate machine, use flash-light). Then some prodding with a wooden skewer to get suspect parts unstuck. This fortunately confirmed that old grease was the cause. Hopefully with frequent exercise the problem will be solved, exercise is anyways important for all mechanical calculators. (Am not confident to take a Comptometer mechanism fully apart to get at the levers inside the 6th column!)
The view from the side gives a pretty good indication of the density of levers, rods and springs throughout the whole machine. It is amazing in its complexity, very clever - mechanically rather marvellous :-)
For example the holes-pattern in the intermediate gear in the register (only a small section visible) is functional (less mass, more speed) - it also is a mechanical detail that's just very nice to see.