Have you used the Eastwood tumbler? I bought their intermediate tumbler and could never get my fasteners clean enough for refinishing. It did reduce the effort needed for bead blasting, though.
69 LV: I think you will find $80-$100 a bargain after you consider the cost of a tumbler and black oxide kit that will not provide a very protective coating. If you plan it out, you should be able to get all your fasteners done for this.
