Things You'll Need
Instructions
Remove the back from your Holga camera. Locate the screws that attach the lens and shutter piece to the main camera body and unscrew them.
Remove the small arm where your secondary aperture should be and set this piece aside. This is where you will be installing your secondary aperture.
Locate the ring on the cloud aperture. Remove this ring to receive a little more light from this setting.
Cut a small square out from the back side of a CD case (make sure the CD case you're using is made of black plastic on the back). Trim it down to the size of the square opening in the secondary aperture arm.
Drill a small hole through the center of your new aperture square. Use an 1/8-inch drill bit if you're not sure what size you want your aperture, but the size may vary depending on your needs.
Tape this secondary aperture square into the opening in the small arm, making sure the tape is facing the inside of the camera. Screw the lens back to the Holga camera body, load your film, and start shooting.