A little more today, The bore for the split cotter was made with the same setup as the graduations, so it is referenced to them. I used a dowel pin through that bore to clamp the part for the dove tails, they should then be indexed to the graduations. Was going to rough out the slot then cut the dove tail on the shaper but got lazy and did it on the mill.
Free advice is worth exactly what you payed for it.
Greg
Greg