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I realize that you said, "no dust" but, I think that the knives and bearings need blowing off.
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Not enough.
They need to be wiped completely clean.
NO OIL.
NO DUST.
NOTHING.
You should also not leave a balance beam scale with knife edges sitting on the edges when not in use.
Lift the beam off and place it near the scale.
The knife edges need to be sharp, clean, and perfect.
Even a tiny bur will affect performance.