If you are a boat builder, as I am, then you are familiar with Splines and Spline Ducks. They are the perfect way to make fair curves.





With Splines and Ducks you can also check that the two curves you draw on the aprons are symmetrical by checking side to side with a caliper.

I have used my Kilt Splines (which are made from a 1 1/2" wide strip of Formica or Arborite) since I began kiltmaking.