Vortex Sound Research

I’ve color coded my cables by function for a long time. Red for envelopes, orange for clocks, yellow for audio, green for gates, blue for mods and purple for pitch.

I recently replaced the nuts on all my jacks with colors as well. But that doesn’t differentiate in/out. So I’m considering putting white/black washers behind the nuts. Great idea, but they are nowhere to be found.

Anyone know offhand where I might find colored washers for jack nuts?