Shure did that when they were reporting on their studies of what the effects of (elliptical ?) sylii had in relation to the tracking force/ultimate psi on a record surface. Rough memory says that about 1.5 grams or so (not exactly positive) equaled out to some 20,000 psi on the record surface. And something to suggest recovery time of 24 (?) hours to avoid permanent damage.
Time was late 60s or early 70s.
Time was late 60s or early 70s.