THE NECESSARY EQUIPMENT
To complete this tutorial, you will need:
- 1 piece of leather 20x30 cm about 1.5 mm thick
- 6 chicago screws - 9 mm diameter with 3x7 cm screws
- 2 T3 collar buttons
- 1 punch cookie cutter, 3 mm in diameter. Not necessarily: a punch cookie cutter of at least 11 mm in diameter
- A slice finish
- 1 cutter
- 1 metal ruler
- 1 abrasive sponge or sandpaper
- 1 screwdriver
- 1 adhesive tape
1. CUT THE PATTERN
Cut out the pattern, then hold the pieces on the piece of leather using masking tape.
Also cut out two round pads (P4) of at least 11mm which will be used to protect the glasses from the collar buttons. You can either cut it with a cutter (you can also make a 2x2cm square so that the piece is easier to cut) or with the help of a round punch cookie cutter. 
2. DRILL THE HOLES
Make the holes using the 3 mm round cookie cutter. Then, cut the leather with a cutter. 
3. Work the edge and back of the leather
For vegetable tanned leather: sand the edge of the leather with sandpaper. Apply tragacanth gum with a brush to the back and edge of the leather. Polish with a cloth.
For other leathers, apply an edge dye.
VIDEO AND GUIDE ON TRADAGANTUS GUM >
4. Screw the inner support
Screw, with the Chicago screws, part P2 (inner support) to the location provided on the pattern. This support will hold the glasses inside the case. 
5. SCREW IN THE COLLAR BUTTONS
Screw the collar buttons onto the front of the case.
Then, protect the collar button screws with the small round pieces. Put double-sided tape (3M type) behind the protective circles and glue them. 
6. OPTION: MAKE A MARKING
Make a mark on the vegetable tanned leather. Personalize the case by stamping alphabet stamps.
HOW TO MARK LEATHER? >
7. Install CHICAGO SCREWS
Assemble the case with the 4 remaining Chicago screws. Place the screw head in the front flap then in the rear flap and in the tab. Screw with a screwdriver. 
8. MAKE THE INCISIONS FOR THE COLLAR BUTTONS
Make 3mm incisions for the collar buttons on the flap (see pattern). 
Your glasses case is finished!
