Nail head shape and outer hub shape? I usually see people say taper the head. I don't see much of anything said about the outer hub other than removing the step. After removing the step, should it be flat or tapered in to match nail head? If tapered in, how should that be done? 135 degree drill bit? I've seen some that are domed outward on Amazon. Flat or domed outward seems like they would have less contact area friction. Should anything be done to the inner hub? Thanks in advance.
