When I use a spirit level @ different spots of my TTs; four corners, mid center, near center, etc., with and without different mats, the bubble is never centered @ all the spots exactly equally.
Question: Is there one spot more important (dead center over the pivot), or a combinations of critical spots of the TT itself or its plinth and with a record mat or not that is best?
Question: Is there one spot more important (dead center over the pivot), or a combinations of critical spots of the TT itself or its plinth and with a record mat or not that is best?