Looking for some input. I have a customer who has old bx wiring(2 wire) that feeds the countertop of the kitchen. There is no gfi protection and with that I was hoping to install gfi breakers instead of individual gfi's. The customer has special wall plates that can't be replaced to fit if we do individual gfi's. The issue is that when the neutral is connected to the breaker and the factory neutral is connected to the neutral/grnd bar it automatically trips when power is restored. Is this because the bx is bonded to the cabinet and because the bonding screw is installed through the ground bar to the cabinet, its tripping because the shared connection between ground and neutral?