|I'm learning to use a French Curve when I grade a curved seam.|
At first I was unclear on how to use it, but I finally realized it's just like using a straight edge,
I need to go from here to there in a gradual way, just not in a straight line.
|Little seam gauges are really handy for adding a precise change in seam allowance|
|A double Clover Wheel (white tool on the right),|
is nice for adding (or decreasing) seam allowances to patterns
Also you can pull out the wheels and make that new seam allowance different widths.