Marine Band customization

So, I've watched your videos on customizing the Marine Band harmonica. Fantastic series. It's really informative and helpful. However, I do have one question. I may be missing it somewhere, but i CAN NOT find a video on putting the harp back together. I know for the Reed plates you use 00-80 screws to assemble the reed plates to the comb. My question is, what all do you use to put the covers back on the harp? What screw, nut, and clearance drill size do you use?