We need to understand that accurate reproduction of wiggles in a microscopic groove can only be achieved if there is a fixed spatial relationship between the TT main bearing and the stylus tip. Otherwise the stylus transmits movement that is not driven by the passing modulated groove.
This fixed relationship must be obtained whilst allowing the arm to move in two planes, so the bearings that do that must have no movement other than those, i.e. no chatter.
This is difficult enough to achieve without building into the spatial relationship three or four more adjustments on the fly. These will necessarily allow unwanted movement that will break the fixed relationship between stylus tip and main bearing. Remember we are talking about movements of less than 1000th of 1mm.
In any case it is not necessary to adjust azimuth once it is correctly set. However thick, all LPs are flat (unless they are warped - and should be discarded).
Accepted VTA on the fly is useful to correct the small differences in thickness between discs, but this is the easiest geometry adjustment to achieve without unwanted movement, by raising the arm pillar using a rack and pinion with low geared adjustment via a wheel control that can be calibrated to achieve total accuracy for a record of known thickness when correctly set up at a base value.
Leave the rest well alone.
This fixed relationship must be obtained whilst allowing the arm to move in two planes, so the bearings that do that must have no movement other than those, i.e. no chatter.
This is difficult enough to achieve without building into the spatial relationship three or four more adjustments on the fly. These will necessarily allow unwanted movement that will break the fixed relationship between stylus tip and main bearing. Remember we are talking about movements of less than 1000th of 1mm.
In any case it is not necessary to adjust azimuth once it is correctly set. However thick, all LPs are flat (unless they are warped - and should be discarded).
Accepted VTA on the fly is useful to correct the small differences in thickness between discs, but this is the easiest geometry adjustment to achieve without unwanted movement, by raising the arm pillar using a rack and pinion with low geared adjustment via a wheel control that can be calibrated to achieve total accuracy for a record of known thickness when correctly set up at a base value.
Leave the rest well alone.