In addition to the examples of new lenses, shimmed and not, that I cited above, I did find a used 55 mm Apo-Grandagon to have a shim .012 inches (about 0.3 mm) thick (measured with dial calipers.) . The shim on my 120 mm Super Symmar HM seemed rather thinner, delicate to the point I'd rather not risk handling and measuring it.
David
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