I just received my Bitzenberger Dial-O-Fletch and have a question regarding putting a feather in the clamp.

In the directions that came with the jig it says, " Allow 1/8" between the base of the vane or feather and the base of the clamp." If I am reading this correctly the feather should not be seating the the clamp as far as it can go in?

In other words when using a red feather (the bases of the feathers are usually white after being shaved) I will actually see part of the red feather when properly seated in the clamp?

Thanks