UPDATE:
I removed some knobs on the Küpper-pegboard organizer. Four knobs are more than enough to keep it in place on the pegboard.
This is my design to store all my rotary tool accessories on my Küpper-/Euro Pegboard.
You can store in this holder 30 shaft-tools, many different discs, key and various things in the two drawers left and right.
The dimension from knob center to center is 35,7mm
I hope you love my design and have the same pleasure to store your tools in it.