The lowest clutch pressure without slippage is the best setting but this only works well if the mount is reasonably well balanced. There is noting in the mechanical design that would cause more or less pressure to change the tracking pe se, the axles are rolling on bearings and the thrust bearings are carrying the thrust load of the clutch. If you apply enough force there will be additional crag that can affect PE but why apply more than enough force than necessary to lock the clutches?? ??
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Chip Louie - Chief Daydreamer Imagination Hardware
Chip Louie