I made one of these to mimic the Circle Device. It wasn’t very good.

• Use denim or other cloth, lead weights (used wheel balancing weights), needle and thread, rubber bands.
• Start with a 20×20 cm piece of material Cut out a 10 cm x 10 cm corner, leaving an “L” shape
• Fold one flap over to hold weight
• Sew it closed, and wrap around penis, holding in pace with elastic bands (or Velcro).