I figured I would put this up because I use it so often when fluting my ribs. Its a piece of delrin that is 2" wide, 9" long and 1/2" thick. The slot in it is at a 30* angle and 5/8 deep. It was my first attempt at a bob stick but didn't work out but it works great for tweaking the flange straight.
I also use it to make sure my flange is at 90*
I also use it to make sure my flange is at 90*