Product review (5 stars): It probably works best if you do both as I only had 2 ...
Just as expected. The only thing I would add is for the inner spring, a) have someone else there to help hold the the spring in place or b) some hand clamps to do it yourself. It probably works best if you do both as I only had 2 clamps and the tension of the spring kept knocking the clamp lose (thankfully my wife was able to hold the clamps in place after that). Also, have a hammer available as the screws on the bottom of the washer could be a pain to get off. I read the top review and they had the same issue as I did where the screws were almost completely stripped when attempting to take them out. A few hammer strikes to a screwdriver and I was good (I did replace these as well). Watch a video on how to do the installation and you'll have no issues replacing this yourself.