This is my first attempt at posting a design, and I hope someone finds it useful. I designed this simple tool holder in Tinkercad. It attaches to the side of the CNC router using two of the existing 5 mm mounting holes and hardware. The holes for the two smallest Allen tools are a bit tight but workable. It is probably obvious but leave the tools out until you install the holder as one of the mounting holes is blocked once the tools are installed.