I watched a few videos before purchasing this tool. Finding the right size for my conditioner was easy. The tool quickly straightened the bent ribs. I made a video for my son that may be too big to attach. Despite dozens of hailstorms hitting my fins, I was able to fix almost all of my fins in about 15 minutes. The tool still looks new and I expect it to last a year if I use it once or twice a year. Highly recommended !