Wilson combat s&w spring kit letdown - Wilson Combat Custom-Tune Spring Kit

I typically use Wolff spring kits but decided to try this Wilson Combat kit. What a letdown! The mainspring wouldn't fit over the connector because the two prongs were too close together. I tried to file/sand the prongs to get them to fit but with no luck. Then I very carefully tried to spread the prongs just ever so and one prong snapped off! The rebound springs were too stiff too. I ended up throwing the Wilson kit away. I bought a Wolff spring kit and it worked perfectly.