Carlon 3.5" round old work electric box replacement wing flipper

I didn't have time to run to the store and buy another box so I designed and printed a replacement wing.  Designed for strength and a little longer than the original.  Did not build in an offset which is fine as long as you are installing in drywall.  For thin walls you may need to modify with some flush cuts.  A proper rounded design for maximum clearance when installing.