I have a sti bare slide. I want to lighten it up. I still have not made any sight cuts yet, I'm probably going with a bo-mar rear and dawson front. Do I have to make sight cuts first, before I make any other cuts? I know want to flatten the top. How deep do I cut the flat top? does any body know which cutters I will need for rear bo-mar and also front for a dawson front sight?