What thread size are those plastic cover screws? It seems like a 6-32 UTS Computer case back screw or something similar would be a nice alternative (Stainless Steel & Knurled head).
Doug the physical size of the hole limits what I can get in. I have my esc's on the outside so i have tons of room. I think my 3s batteries are too old and not giving me the performance they once did. Im getting just 4 minutes safely with a 3000mah 3s when carrying my gopro and fpv gear. Time for a couple of new 3000mah 3s batteries i think