If the spanner nut was put on too tight, would that affect spinning at all?
Answer Hello Kristen. No, not unless it broke and was not holding the tub assembly down in the unit. You need to check the clutch and the drive block in the unit.
What do you replace when the drum shakes like crazy when it's done on the spin cycle?
Answer Hello Rudy. You need to remove the agitator and see if the drive block 389140 is stripped out in the unit.
When the wash cycle is initiated there is a loud squeel from the machine until it moves into the next cycle. What may the problem be?
Answer Hi. If there are debris in the pump #  it will make this noise. Remove the pump hoses and see if there is anything in the impeller or in between the outer impeller and the housing itself. Then when the unit reverses into the spin mode, it turns the opposite direction and water is drained. If you see black rubber and plastic pieces under the center of the unit then you need to unclasp the motor coupler part # 285753A. Thank You.