1" long is not a problem at all, but the diameter of a pencil eraser ?, wow that is a lot of hair, won't this leave a bald spot (if it is taken from the same area) ?

Just to make sure, you mean that the area of skin from which the hair is cut should be the diameter of a pencil eraser (this is not so much hair), or do you mean that after the hair is cut the sample should have the diameter of a pencil eraser (this is *a lot* of hair) ?