As you are working with your pattern, you may make changes that effect the position of points at the end of dart legs. In order for darts to be sewn properly, it is important that the dart legs are of the same length.

This tool allows you to quickly adjust dart legs so they are the same length. This will use the pivot point of the dart as the vector to adjust the length staying true to the original angle of the legs.

Select the point at the end of the dart leg that is the correct length.

The other leg will be adjusted to match.