Vintage Windmill and Wind Generator Forum

Have been assembling a fan for a B602 Aermotor today .
The photos show an extra knotch for the sail clip ? is that extra normal for a 1923 Aermotor B ?
Mike B
New Braunfels TX

I thought those were in all Aermotor blades. Or at least all the ones I've seen.

I did not notice the extra knoch on the A702 blades . Maybe just oblivous .