https://www.jco-online.com/archive/1986/01/43-angulation-of-the-crossover-wires-for-advancement-of-the-fr-2-appliance/
Modified Frankel 2 with Angulated Crossover Wires
Learn how to modify a Frankel 2 appliance with angulated crossover wires.
modifiedfrankelcrossoverwires