Nylon Butterfly Hinges

• 1). Use a straightedge to mark the hinge line along each of the two surfaces that will be hinged together. This line will almost always be along the centerline of the part thickness.
  
  
• 2). At regular and matched intervals along the hinge lines, cut a pocket for each hinge flap to slip into. These pockets should be slightly less than the thickness of the hinge, to allow for a tight fit. Space your hinge pockets evenly along the control surface; check your model airplane plans for recommended hinge locations and sizes.
  
  
• 3). Insert hinges into each pocket along the aircraft side of a hinge line and secure with several drops of CA glue on each hinge. Be sure not to get any glue on the actual hinge mechanism.
  
  
• 4). Align the control surface you're installing with the hinges installed on the aircraft and press into place. Secure the hinges into the control surface with several drops of CA glue.