I don't currently own a VPI but have had several in years past. The two best systems in my experience is the Cart Align (no longer made) and WallyTractor.
The couple of millimeters in one direction or another, combined with VTA and tracking force is what separates a wonderful set up from an average one. Believe me it's worth doing and you have a table that will reveal those differences.
The couple of millimeters in one direction or another, combined with VTA and tracking force is what separates a wonderful set up from an average one. Believe me it's worth doing and you have a table that will reveal those differences.