When sourcing Screws, best to find 12.9 grade screws. They are stronger. Bend and strip way less easily. The 4x4 line use only 10.9 grade, less stronger. ALL the 6s Arrma models use 12.9 grade. The little things like this separate the 6s line from the 4x4 line of Arrma models. I buy all my screw kits from JennysRC. I sort all the hardware into small divider boxes. Sometimes if I want a unique screw, I will go to McMaster Carr for them. i.e. the 6s Motor mount meshing screws. I up size them, using 2.5mm Socket Head screws. The "Button Head" 2.0mm hexed stockers' strip out too easily.