Even a cheaper record player will often have some kind of adjustment on the motor itself. There is sometimes a small screw on the motor that can do some fine ad

Even a cheaper record player will often have some kind of adjustment on the motor itself. There is sometimes a small screw on the motor that can do some fine adjustments of the speed. Belts age. Friction within the motor and the table's bearing will change over time. It is not necessarily a frequent thing that needs to be done, but usually the speed will change slightly over the life of the table.