If the receiver is not pitted or rusted, it's pretty much ready to go. If there are surface blemishes you need to get rid of, let Turnbull do the heat work and polishing.
If you are handy around tools you can save some bucks by doing a little disassembly ahead of time. NIDs come apart pretty easily, aside possibly from some sticky pins. You will need properly sized cupped punches, a couple fitted screwdrivers, and a custom-made spanner for the mainspring retainer nuts (up front). If you can't get those little nuts on and off properly, pass the job on to the pros. The little screws that hold the firing pins may or may not come out. No matter, the pins can get cased too and Turnbull represents that everything will work fine.
