Hi,
If you still use a physical adding machine, and need to replace the ink roller, there is an alternative.
My Wife uses an adding machine from time to time. Recently when she used it, it did not print very well (very light print).
Since she also has a stamping hobby making greeting cards, I decided to use one of her stamp pad inkers. She has several bottles of different colors.
After I removed the ink roller, I applied one of the stamp pad inkers to the roller. By golly, that worked!
John