nice one Nicko, wondered who's neck was getting fretted by DB.
What are your plans for the stain ? If I put a coat of black down to pop the flames I don't sand the cap at all. First sanding is to remove the black coat. See if you can get an idea of the thickness of the cap looking in pup cavities but generally they are about half a mm thick so good move to start sanding on higher grits, not less than 240 I'd suggest