lewm
... gravity is a constant for any particular location on earth, however, actual VTF will vary depending upon where the tonearm is located in its vertical arc. This happens when you play a warped LP, for exampleVarying VTF while playing a warped record is the result of dynamic forces. What we're talking about here is static VTF, which does not "vary depending upon where the tonearm is located in its vertical arc."