Product review (5 stars): It took both of us and YouTube but we did it!
It was exactly what we needed. My husband and I took on the job after watching a tutorial on YouTube. We have never repaired anything like this. We took it step by step and managed to get it replaced after trial and error.  We did purchase the expensive tool. The inside spring was so tight I don't think we would have ever got it back on without it. The outside spring was easy.