Just need to quickly share my experience with what I’m dubbing the ‘magic pen’ before I put up the B/C register schematics (yup, they’re finally ready). If you’ve read my recent posts you’ll know I ordered in some laser cut acrylic parts for my enclosure including one part which is engraved as well as cut for the switch panel. Close up it looks like this:
Only problem now is I’ve got tons of cleaning fluid left and a pen mostly full of paint so I’m off now to find things around the house to draw on.