2011-12-03 The machine was very hard to operated, probably due to dried out oil. (relatively small amount of outside dust). Paint is a little dirty / oil deposits). Whole internal machine sprayed with W40.
2011-12-05: The W40 has done a good job. The machine can be operate smoothly. The adding and calculation check passed.
2011-12-06: Divide, subtract, automate divide and reverse input all Ok.
Machine cleaned and the numbers are shiny clear again.
The Shift mechanism to switch between, add - multiply, which caused the sliders set zero, after add, is not functioning. The steel pin is obviously broken. (Considered as minor fault). After cleaning, the set zero handle is losing the nearly all his paint.
2011-12-23 from a spare machine the front plate (which was in a better shape) and the crank for the zero setting input, replaced. This solved the zero setting of the input shifters at an add.