The tonearm must be mounted so that it has a fixed relationship between the TT spindle and the the tonearm pivot and that relationship should be very ridged. Any movement between the two points will be read as a signal being generated in the cartridge causing a blurring of the music. Remember, there is a lot of vibration being fed into the cartridge, It travels up into the tonearm. You don't want the tonearm vibrating around. It should be held secure.
BillWojo
BillWojo