A4 paper folding helper (customizible)

Sometimes you'll need to fold A4 in a half (booklet print 4 pages on 1 doublesided A4).
So this little tool will help you a lot.

Small coin or washer needed.

After assembly place test piece of paper, if it doesn't fit - use paper knife and cut adjustment cube side.

Correct 90 degrees angle on sides connection not required.

You can use it with only one side is connected left or right.

You can place top block to the left or right side.
Step 1. Assembling (full or half).
Step 2. Place a paper sheet, adjust if needed.
Step 3. Place top block. Insert a finger between top block and opposite anjustment cube to move it to the right place.
Step 4. While holding top block slide 45 degrees tilted coin/washer across whole page
Step 5. Now you have folding mark.
Step 6. Adjust corners while folding to receive perfect fold.
Repeat steps 2-6 for other paper sheets.