The notches on the very grind will adjust how much the angle of the side of the wing is. The further forward the arm goes the straighter the wing will be. And just the opposite the further back the arm is the more the wing is rolled in toward the flute. If you set the sliding long arm at say 7" from the wheel and just change the vari-grind arm you can change the wing angle. I set mine at 2 notches up from all the way forward,I use a 2 1/8"protrusion and 7" from the wheel.That gives me a 60* bowl grind with a wing angle that lets me shear scrap and cut very nicely.I only have to adjust to 6" from the wheel and that gives me a 45* bevel and a small wing on my spindle gouges.
Works for me.
Comments and Constructive Criticism Welcome
Haste in every craft or business brings failures. Herodotus,450 B.C.