Ok my quest for all clear when off and blue when on continues. eBay 1/32” discs that are 7/8” diameter are almost a perfect fit. I had to sand around the edge until it fit inside the cover. I used rub on transfers for the lettering. Put Mylar over the top to keep the letters from falling off.
69B36E4C-E01A-4C28-BCA5-29BD829A4F4F (resized).jpegAAE748C7-A00B-45C1-A968-E4AD1A09B56E (resized).jpegB550354D-06CB-442D-ACB3-04AD3DDDBD64 (resized).jpeg